This is an automated email from the ASF dual-hosted git repository. pkarwasz pushed a commit to branch doc/2.x/filters in repository https://gitbox.apache.org/repos/asf/logging-log4j2.git
commit 07b70fec73f8ab34c22bce44577f082a224a5f5a Author: Piotr P. Karwasz <[email protected]> AuthorDate: Fri Jul 5 16:34:46 2024 +0200 Revamp the `Filters` page In this PR we: - add a section about the filtering process, that explains in detail all the places, where a filter can be configured. - add the description of 3 filters, - improve the documentation of the remaining filters, by replacing the complete XML configuration examples with shorter examples in 4 formats that concentrate on the filter itself. Closes #2529, [LOG4J2-3485](https://issues.apache.org/jira/browse/LOG4J2-3485) and [LOG4J2-3682](https://issues.apache.org/jira/browse/LOG4J2-3682). --- .../examples/manual/filters/ContextMapFilter.json | 38 + .../manual/filters/ContextMapFilter.properties | 25 + .../examples/manual/filters/ContextMapFilter.xml | 26 + .../examples/manual/filters/ContextMapFilter.yaml | 22 + .../manual/filters/DynamicThresholdFilter.json | 35 + .../filters/DynamicThresholdFilter.properties | 23 + .../manual/filters/DynamicThresholdFilter.xml | 24 + .../manual/filters/DynamicThresholdFilter.yaml | 21 + .../ROOT/examples/manual/filters/MapFilter.json | 38 + .../examples/manual/filters/MapFilter.properties | 25 + .../ROOT/examples/manual/filters/MapFilter.xml | 24 + .../ROOT/examples/manual/filters/MapFilter.yaml | 22 + .../manual/filters/MutableContextMapFilter.json | 24 + .../filters/MutableContextMapFilter.properties | 12 + .../manual/filters/MutableContextMapFilter.xml | 21 + .../manual/filters/MutableContextMapFilter.yaml | 15 + .../ROOT/examples/manual/filters/ScriptFilter.json | 34 + .../manual/filters/ScriptFilter.properties | 20 + .../ROOT/examples/manual/filters/ScriptFilter.xml | 26 + .../ROOT/examples/manual/filters/ScriptFilter.yaml | 22 + .../manual/filters/StructuredDataFilter.json | 38 + .../manual/filters/StructuredDataFilter.properties | 25 + .../manual/filters/StructuredDataFilter.xml | 24 + .../manual/filters/StructuredDataFilter.yaml | 22 + .../ROOT/examples/manual/filters/TimeFilter.json | 38 + .../examples/manual/filters/TimeFilter.properties | 22 + .../ROOT/examples/manual/filters/TimeFilter.xml | 26 + .../ROOT/examples/manual/filters/TimeFilter.yaml | 24 + .../ROOT/examples/manual/filters/configs.json | 11 + .../ROOT/examples/manual/filters/configs2.json | 10 + .../ROOT/examples/manual/filters/filters.json | 23 +- .../examples/manual/filters/filters.properties | 37 +- .../ROOT/examples/manual/filters/filters.xml | 20 +- .../ROOT/examples/manual/filters/filters.yaml | 28 +- .../ROOT/examples/manual/filters/global.groovy | 3 + .../ROOT/examples/manual/filters/local.groovy | 1 + .../modules/ROOT/pages/manual/configuration.adoc | 20 +- .../modules/ROOT/pages/manual/customloglevels.adoc | 2 +- .../antora/modules/ROOT/pages/manual/filters.adoc | 2075 ++++++++++++-------- .../antora/modules/ROOT/pages/manual/messages.adoc | 2 +- .../antora/modules/ROOT/pages/manual/scripts.adoc | 3 + .../manual/systemproperties/properties-async.adoc | 2 +- 42 files changed, 2042 insertions(+), 911 deletions(-) diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.json new file mode 100644 index 0000000000..9ff7a6bb9f --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.json @@ -0,0 +1,38 @@ +{ + "Configuration": { + "monitorInterval": 10, + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "ALL", + "AppenderRef": { + "ref": "CONSOLE" + } + } + }, + // tag::filter[] + "ContextMapFilter": { + "operator": "AND", + "KeyValuePair": [ + { + "key": "clientId", + "value": "1234" + }, + { + "key": "userId", + "value": "alice" + }, + { + "key": "userId", + "value": "bob" + } + ] + } + // end::filter[] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.properties new file mode 100644 index 0000000000..2b6f233e70 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.properties @@ -0,0 +1,25 @@ +monitorInterval = 10 + +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +rootLogger.level = ALL +rootLogger.appenderRef.0.ref = CONSOLE + +# tag::filter[] +filter.0.type = ContextMapFilter +filter.0.operator = AND + +filter.0.kv0.type = KeyValuePair +filter.0.kv0.key = clientId +filter.0.kv0.value = 1234 + +filter.0.kv1.type = KeyValuePair +filter.0.kv1.key = userId +filter.0.kv1.value = alice + +filter.0.kv2.type = KeyValuePair +filter.0.kv2.key = userId +filter.0.kv2.value = bob +# end::filter[] diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.xml new file mode 100644 index 0000000000..d23db1fb84 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.xml @@ -0,0 +1,26 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd"; + monitorInterval="10"> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <Root level="ALL"> + <AppenderRef ref="CONSOLE"/> + </Root> + </Loggers> + <!-- tag::filter[] --> + <ContextMapFilter operator="AND"> + <!-- tag::kvp[] --> + <KeyValuePair key="clientId" value="1234"/> + <KeyValuePair key="userId" value="alice"/> + <KeyValuePair key="userId" value="bob"/> + <!-- end::kvp[] --> + </ContextMapFilter> + <!-- end::filter[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.yaml new file mode 100644 index 0000000000..9784f7864d --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ContextMapFilter.yaml @@ -0,0 +1,22 @@ +Configuration: + monitorInterval: 10 + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: { } + Loggers: + Root: + level: "ALL" + AppenderRef: + ref: "CONSOLE" + # tag::filter[] + ContextMapFilter: + operator: "AND" + KeyValuePair: + - key: "clientId" + value: "1234" + - key: "userId" + value: "alice" + - key: "userId" + value: "bob" + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.json new file mode 100644 index 0000000000..12b6fb95fb --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.json @@ -0,0 +1,35 @@ +{ + "Configuration": { + "monitorInterval": 10, + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "ALL", + "AppenderRef": { + "ref": "CONSOLE" + } + } + }, + // tag::filter[] + "DynamicThresholdFilter": { + "key": "loginId", // <3> + "defaultThreshold": "ERROR", + "KeyValuePair": [ + { // <1> + "key": "alice", + "value": "DEBUG" + }, + { // <2> + "key": "bob", + "value": "INFO" + } + ] + } + // end::filter[] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.properties new file mode 100644 index 0000000000..c9b1d85f89 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.properties @@ -0,0 +1,23 @@ +monitorInterval = 10 + +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +rootLogger.level = ALL +rootLogger.appenderRef.0.ref = CONSOLE + +# tag::filter[] +filter.0.type = DynamicThresholdFilter +filter.0.key = loginId +# <3> +filter.0.defaultThreshold = ERROR +# <1> +filter.0.kv0.type = KeyValuePair +filter.0.kv0.key = alice +filter.0.kv0.value = DEBUG +# <2> +filter.0.kv1.type = KeyValuePair +filter.0.kv1.key = bob +filter.0.kv1.value = INFO +# end::filter[] diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.xml new file mode 100644 index 0000000000..05ad714c82 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.xml @@ -0,0 +1,24 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd"; + monitorInterval="10"> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <Root level="ALL"> + <AppenderRef ref="CONSOLE"/> + </Root> + </Loggers> + <!-- tag::filter[] --> + <DynamicThresholdFilter key="loginId" + defaultThreshold="ERROR"> <!--3--> + <KeyValuePair key="alice" value="DEBUG"/> <!--1--> + <KeyValuePair key="bob" value="INFO"/> <!--2--> + </DynamicThresholdFilter> + <!-- end::filter[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.yaml new file mode 100644 index 0000000000..83ac3fa16c --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/DynamicThresholdFilter.yaml @@ -0,0 +1,21 @@ +Configuration: + monitorInterval: 10 + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: { } + Loggers: + Root: + level: "ALL" + AppenderRef: + ref: "CONSOLE" + # tag::filter[] + DynamicThresholdFilter: + key: "loginId" + defaultThreshold: "ERROR" # <3> + KeyValuePair: + - key: "alice" # <1> + value: "DEBUG" + - key: "bob" # <2> + value: "INFO" + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.json new file mode 100644 index 0000000000..9b49b533f9 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.json @@ -0,0 +1,38 @@ +{ + "Configuration": { + "monitorInterval": 10, + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "ALL", + "AppenderRef": { + "ref": "CONSOLE" + } + } + }, + // tag::filter[] + "MapFilter": { + "operator": "AND", + "KeyValuePair": [ + { + "key": "eventType", + "value": "authentication" + }, + { + "key": "eventId", + "value": "login" + }, + { + "key": "eventId", + "value": "logout" + } + ] + } + // end::filter[] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.properties new file mode 100644 index 0000000000..4cc05cdd4d --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.properties @@ -0,0 +1,25 @@ +monitorInterval = 10 + +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +rootLogger.level = ALL +rootLogger.appenderRef.0.ref = CONSOLE + +# tag::filter[] +filter.0.type = MapFilter +filter.0.operator = AND + +filter.0.kv0.type = KeyValuePair +filter.0.kv0.key = eventType +filter.0.kv0.value = authentication + +filter.0.kv1.type = KeyValuePair +filter.0.kv1.key = eventId +filter.0.kv1.value = login + +filter.0.kv2.type = KeyValuePair +filter.0.kv2.key = eventId +filter.0.kv2.value = logout +# end::filter[] diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.xml new file mode 100644 index 0000000000..ed5f42e499 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.xml @@ -0,0 +1,24 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd"; + monitorInterval="10"> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <Root level="ALL"> + <AppenderRef ref="CONSOLE"/> + </Root> + </Loggers> + <!-- tag::filter[] --> + <MapFilter operator="AND"> + <KeyValuePair key="eventType" value="authentication"/> + <KeyValuePair key="eventId" value="login"/> + <KeyValuePair key="eventId" value="logout"/> + </MapFilter> + <!-- end::filter[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.yaml new file mode 100644 index 0000000000..fc8184312a --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MapFilter.yaml @@ -0,0 +1,22 @@ +Configuration: + monitorInterval: 10 + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: { } + Loggers: + Root: + level: "ALL" + AppenderRef: + ref: "CONSOLE" + # tag::filter[] + MapFilter: + operator: "AND" + KeyValuePair: + - key: "eventType" + value: "authentication" + - key: "eventId" + value: "login" + - key: "eventId" + value: "logout" + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.json new file mode 100644 index 0000000000..f221178b6a --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.json @@ -0,0 +1,24 @@ +{ + "Configuration": { + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "ALL", + "AppenderRef": { + "ref": "CONSOLE" + } + } + }, + // tag::filter[] + "MutableContextMapFilter": { + "configLocation": "https://server.example/configs.json";, + "pollInterval": 10 + } + // end::filter[] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.properties new file mode 100644 index 0000000000..689975ead3 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.properties @@ -0,0 +1,12 @@ +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +rootLogger.level = ALL +rootLogger.appenderRef.0.ref = CONSOLE + +# tag::filter[] +filter.0.type = MutableContextMapFilter +filter.0.configLocation = https://server.example/configs.json +filter.0.pollInterval = 10 +# end::filter[] diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.xml new file mode 100644 index 0000000000..3d9129b99c --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.xml @@ -0,0 +1,21 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd";> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <Root level="ALL"> + <AppenderRef ref="CONSOLE"/> + </Root> + </Loggers> + <!-- tag::filter[] --> + <MutableContextMapFilter + configLocation="https://server.example/configs.json"; + pollInterval="10"/> + <!-- end::filter[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.yaml new file mode 100644 index 0000000000..91e16d9d35 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/MutableContextMapFilter.yaml @@ -0,0 +1,15 @@ +Configuration: + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: { } + Loggers: + Root: + level: "ALL" + AppenderRef: + ref: "CONSOLE" + # tag::filter[] + MutableContextMapFilter: + configLocation: "https://server.example/configs.json"; + pollInterval: 10 + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.json new file mode 100644 index 0000000000..2703a976ee --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.json @@ -0,0 +1,34 @@ +{ + "Configuration": { + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + // tag::local[] + "Root": { + "level": "ALL", + "ScriptFilter": { + "ScriptFile": { + "language": "groovy", + "path": "scripts/local.groovy" + } + }, + "AppenderRef": { + "ref": "CONSOLE" + } + } + // end::local[] + } + }, + // tag::global[] + "ScriptFilter": { + "ScriptFile": { + "language": "groovy", + "path": "scripts/global.groovy" + } + } + // end::global[] +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.properties new file mode 100644 index 0000000000..d2b17951bf --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.properties @@ -0,0 +1,20 @@ +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +# tag::local[] +rootLogger.level = ALL + +rootLogger.filter.0.type = ScriptFilter +rootLogger.filter.0.script.type = ScriptFile +rootLogger.filter.0.script.language = groovy +rootLogger.filter.0.script.path = scripts/local.groovy + +rootLogger.appenderRef.0.ref = CONSOLE +# end::local[] +# tag::global[] +filter.0.type = ScriptFilter +filter.0.script.type = ScriptFile +filter.0.script.language = groovy +filter.0.script.path = scripts/global.groovy +# end::global[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.xml new file mode 100644 index 0000000000..c725c0230f --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.xml @@ -0,0 +1,26 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd";> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <!-- tag::local[] --> + <Root level="ALL"> + <ScriptFilter> + <ScriptFile language="groovy" path="scripts/local.groovy"/> + </ScriptFilter> + <AppenderRef ref="CONSOLE"/> + </Root> + <!-- end::local[] --> + </Loggers> + <!-- tag::global[] --> + <ScriptFilter> + <ScriptFile language="groovy" path="scripts/global.groovy"/> + </ScriptFilter> + <!-- end::global[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.yaml new file mode 100644 index 0000000000..c95dad29a8 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/ScriptFilter.yaml @@ -0,0 +1,22 @@ +Configuration: + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: {} + Loggers: + # tag::local[] + Root: + level: "ALL" + ScriptFilter: + ScriptFile: + language: "groovy" + path: "scripts/local.groovy" + AppenderRef: + ref: "CONSOLE" + # end::local[] + # tag::global[] + ScriptFilter: + ScriptFile: + language: "groovy" + path: "scripts/global.groovy" + # end::global[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.json new file mode 100644 index 0000000000..6516d84130 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.json @@ -0,0 +1,38 @@ +{ + "Configuration": { + "monitorInterval": 10, + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "ALL", + "AppenderRef": { + "ref": "CONSOLE" + } + } + }, + // tag::filter[] + "StructuredDataFilter": { + "operator": "AND", + "KeyValuePair": [ + { + "key": "id", + "value": "authentication" + }, + { + "key": "userId", + "value": "alice" + }, + { + "key": "userId", + "value": "bob" + } + ] + } + // end::filter[] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.properties new file mode 100644 index 0000000000..ecf18a1d44 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.properties @@ -0,0 +1,25 @@ +monitorInterval = 10 + +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +rootLogger.level = ALL +rootLogger.appenderRef.0.ref = CONSOLE + +# tag::filter[] +filter.0.type = StructuredDataFilter +filter.0.operator = AND + +filter.0.kv0.type = KeyValuePair +filter.0.kv0.key = id +filter.0.kv0.value = authentication + +filter.0.kv1.type = KeyValuePair +filter.0.kv1.key = userId +filter.0.kv1.value = alice + +filter.0.kv2.type = KeyValuePair +filter.0.kv2.key = userId +filter.0.kv2.value = bob +# end::filter[] diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.xml new file mode 100644 index 0000000000..0b4988c063 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.xml @@ -0,0 +1,24 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd"; + monitorInterval="10"> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + </Appenders> + <Loggers> + <Root level="ALL"> + <AppenderRef ref="CONSOLE"/> + </Root> + </Loggers> + <!-- tag::filter[] --> + <StructuredDataFilter operator="AND"> + <KeyValuePair key="id" value="authentication"/> + <KeyValuePair key="userId" value="alice"/> + <KeyValuePair key="userId" value="bob"/> + </StructuredDataFilter> + <!-- end::filter[] --> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.yaml new file mode 100644 index 0000000000..fc2fbd7ac5 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/StructuredDataFilter.yaml @@ -0,0 +1,22 @@ +Configuration: + monitorInterval: 10 + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: { } + Loggers: + Root: + level: "ALL" + AppenderRef: + ref: "CONSOLE" + # tag::filter[] + StructuredDataFilter: + operator: "AND" + KeyValuePair: + - key: "id" + value: "authentication" + - key: "userId" + value: "alice" + - key: "userId" + value: "bob" + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.json b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.json new file mode 100644 index 0000000000..39bd062095 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.json @@ -0,0 +1,38 @@ +{ + "Configuration": { + "Appenders": { + "Console": { + "name": "CONSOLE", + "JsonTemplateLayout": {} + }, + "SMTP": { + "name": "SMTP", + "to": "root@localhost", + "JsonTemplateLayout": {} + } + }, + "Loggers": { + "Root": { + "level": "INFO", + // tag::filter[] + "AppenderRef": [ + { + "ref": "CONSOLE", + "TimeFilter": { + "start": "08:00:00", + "end": "16:00:00" + } + }, + { + "ref": "SMTP", + "TimeFilter": { + "start": "16:00:00", + "end": "08:00:00" + } + } + ] + // end::filter[] + } + } + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.properties b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.properties new file mode 100644 index 0000000000..12bbe2c192 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.properties @@ -0,0 +1,22 @@ +appender.0.type = Console +appender.0.name = CONSOLE +appender.0.layout.type = JsonTemplateLayout + +appender.1.type = SMTP +appender.1.name = SMTP +appender.1.to = root@localhost +appender.1.layout.type = JsonTemplateLayout + +rootLogger.level = INFO +# tag::filter[] +rootLogger.appenderRef.0.ref = CONSOLE +rootLogger.appenderRef.0.filter.0.type = TimeFilter +rootLogger.appenderRef.0.filter.0.start = 08:00:00 +rootLogger.appenderRef.0.filter.0.end = 16:00:00 + +rootLogger.appenderRef.1.ref = SMTP +rootLogger.appenderRef.1.filter.0.type = TimeFilter +rootLogger.appenderRef.1.filter.0.start = 16:00:00 +rootLogger.appenderRef.1.filter.0.end = 08:00:00 +# end::filter[] + diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.xml b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.xml new file mode 100644 index 0000000000..4db02da038 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.xml @@ -0,0 +1,26 @@ +<?xml version="1.0" encoding="UTF-8" ?> +<Configuration xmlns="https://logging.apache.org/xml/ns"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; + xsi:schemaLocation=" + https://logging.apache.org/xml/ns + https://logging.apache.org/xml/ns/log4j-config-2.xsd";> + <Appenders> + <Console name="CONSOLE"> + <JsonTemplateLayout/> + </Console> + <SMTP name="SMTP" to="root@localhost"> + <JsonTemplateLayout/> + </SMTP> + </Appenders> + <Loggers> + <Root level="INFO"> + <!-- tag::filter[] --> + <AppenderRef ref="CONSOLE"> + <TimeFilter start="08:00:00" end="16:00:00"/> + </AppenderRef> + <AppenderRef ref="SMTP"> + <TimeFilter start="16:00:00" end="08:00:00"/> + </AppenderRef> + <!-- end::filter[] --> + </Root> + </Loggers> +</Configuration> \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.yaml new file mode 100644 index 0000000000..821528e8fa --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/TimeFilter.yaml @@ -0,0 +1,24 @@ +Configuration: + monitorInterval: 10 + Appenders: + Console: + name: "CONSOLE" + JsonTemplateLayout: {} + SMTP: + name: "SMTP" + to: "root@localhost" + JsonTemplateLayout: {} + Loggers: + Root: + level: "INFO" + # tag::filter[] + AppenderRef: + - ref: "CONSOLE" + TimeFilter: + start: "08:00:00" + end: "16:00:00" + - ref: "SMTP" + TimeFilter: + start: "16:00:00" + end: "08:00:00" + # end::filter[] \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/configs.json b/src/site/antora/modules/ROOT/examples/manual/filters/configs.json new file mode 100644 index 0000000000..b78065eece --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/configs.json @@ -0,0 +1,11 @@ +{ + "configs": { + "clientId": [ + "1234" + ], + "userId": [ + "alice", + "bob" + ] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/configs2.json b/src/site/antora/modules/ROOT/examples/manual/filters/configs2.json new file mode 100644 index 0000000000..0528cc6c83 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/configs2.json @@ -0,0 +1,10 @@ +{ + "configs": { + "clientId": [ + "1234" // <1> + ], + "userId": [ + "root" // <2> + ] + } +} \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/filters.json b/src/site/antora/modules/ROOT/examples/manual/filters/filters.json index 4acc4c43b7..752f68b2ab 100644 --- a/src/site/antora/modules/ROOT/examples/manual/filters/filters.json +++ b/src/site/antora/modules/ROOT/examples/manual/filters/filters.json @@ -4,33 +4,36 @@ "Console": { "name": "CONSOLE", "ThresholdFilter": { - "level": "WARN" // <6> + "level": "FATAL" // <6> } } }, "Loggers": { "Root": { - "level": "INFO", + "level": "OFF", "ThresholdFilter": { // <3> - "level": "DEBUG" + "level": "WARN" }, "AppenderRef": { "ref": "CONSOLE", - "level": "WARN", // <5> - "MarkerFilter": { // <4> - "marker": "ALERT", - "onMatch": "NEUTRAL", - "onMismatch": "DENY" + "level": "ERROR", // <4> + "MarkerFilter": { // <5> + "marker": "SECURITY_ALERT" } } }, "Logger": { "name": "org.example", - "level": "TRACE" // <2> + "level": "DEBUG", // <2> + "ThresholdFilter": { // <3> + "level": "INFO" + } } } }, "MarkerFilter": { // <1> - "marker": "PRIVATE" + "marker": "ALERT", + "onMatch": "ACCEPT", + "onMismatch": "NEUTRAL" } } \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/filters.properties b/src/site/antora/modules/ROOT/examples/manual/filters/filters.properties index 1077fc44e7..b98760c8e4 100644 --- a/src/site/antora/modules/ROOT/examples/manual/filters/filters.properties +++ b/src/site/antora/modules/ROOT/examples/manual/filters/filters.properties @@ -16,23 +16,30 @@ # appender.0.type = Console appender.0.name = CONSOLE -appender.0.filter.type = ThresholdFilter # <6> -appender.0.filter.level = WARN +# <7> +appender.0.filter.type = ThresholdFilter +appender.0.filter.level = FATAL -rootLogger.level = INFO -rootLogger.filter.type = ThresholdFilter # <3> -rootLogger.filter.level = DEBUG +rootLogger.level = OFF +# <4> +rootLogger.filter.type = ThresholdFilter +rootLogger.filter.level = WARN rootLogger.appenderRef.0.ref = CONSOLE -rootLogger.appenderRef.0.level = WARN # <5> -rootLogger.appenderRef.0.filter.type = MarkerFilter # <4> -rootLogger.appenderRef.0.filter.marker = ALERT -rootLogger.appenderRef.0.filter.onMatch = NEUTRAL -rootLogger.appenderRef.0.filter.onMismatch = DENY +# <5> +rootLogger.appenderRef.0.level = ERROR +# <6> +rootLogger.appenderRef.0.filter.type = MarkerFilter +rootLogger.appenderRef.0.filter.marker = SECURITY_ALERT logger.0.name = org.example -logger.0.level = DEBUG # <2> -logger.0.filter.type = ThresholdFilter # <3> -logger.0.filter.level = TRACE +# <2> +logger.0.level = DEBUG +# <3> +logger.0.filter.type = ThresholdFilter +logger.0.filter.level = INFO -filter.type = MarkerFilter # <1> -filter.marker = PRIVATE +# <1> +filter.0.type = MarkerFilter +filter.0.marker = ALERT +filter.0.onMatch = ACCEPT +filter.0.onMismatch = NEUTRAL diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/filters.xml b/src/site/antora/modules/ROOT/examples/manual/filters/filters.xml index 4c86b04faf..8584d87096 100644 --- a/src/site/antora/modules/ROOT/examples/manual/filters/filters.xml +++ b/src/site/antora/modules/ROOT/examples/manual/filters/filters.xml @@ -22,21 +22,21 @@ https://logging.apache.org/xml/ns/log4j-config-2.xsd";> <Appenders> <Console name="CONSOLE"> - <ThresholdFilter level="WARN"/> <!--6--> + <ThresholdFilter level="FATAL"/> <!--7--> </Console> </Appenders> <Loggers> - <Root level="INFO"> - <ThresholdFilter level="DEBUG"/> <!--3--> - <AppenderRef ref="CONSOLE" level="WARN"> <!--5--> - <MarkerFilter marker="ALERT" - onMatch="NEUTRAL" - onMismatch="DENY"/> <!--4--> + <Root level="OFF"> + <ThresholdFilter level="WARN"/> <!--4--> + <AppenderRef ref="CONSOLE" level="ERROR"> <!--5--> + <MarkerFilter marker="SECURITY_ALERT"/> <!--6--> </AppenderRef> </Root> - <Logger name="org.example" level="TRACE"> <!--2--> - <ThresholdFilter level="TRACE"/> <!--3--> + <Logger name="org.example" level="DEBUG"> <!--2--> + <ThresholdFilter level="INFO"/> <!--3--> </Logger> </Loggers> - <MarkerFilter marker="PRIVATE"/> <!--1--> + <MarkerFilter marker="ALERT" + onMatch="ACCEPT" + onMismatch="NEUTRAL"/> <!--1--> </Configuration> diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/filters.yaml b/src/site/antora/modules/ROOT/examples/manual/filters/filters.yaml index 9a4f61f346..bc1c72637c 100644 --- a/src/site/antora/modules/ROOT/examples/manual/filters/filters.yaml +++ b/src/site/antora/modules/ROOT/examples/manual/filters/filters.yaml @@ -18,24 +18,24 @@ Configuration: Appenders: Console: name: "CONSOLE" - ThresholdFilter: # <6> - level: "WARN" + ThresholdFilter: # <7> + level: "FATAL" Loggers: Root: - level: "INFO" - ThreadsholdFilter: # <3> - level: "DEBUG" + level: "OFF" + ThresholdFilter: # <4> + level: "WARN" AppenderRef: ref: "CONSOLE" - level: "WARN" # <5> - MarkerFilter: # <4> - marker: "ALERT" - onMatch: "NEUTRAL" - onMismatch: "DENY" + level: "ERROR" # <5> + MarkerFilter: # <6> + marker: "SECURITY_ALERT" Logger: name: "org.example" - level: "TRACE" # <2> - ThresholdFilter: - level: "TRACE" # <3> + level: "DEBUG" # <2> + ThresholdFilter: # <3> + level: "INFO" MarkerFilter: # <1> - marker: "PRIVATE" + marker: "ALERT" + onMatch: "ACCEPT" + onMismatch: "NEUTRAL" diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/global.groovy b/src/site/antora/modules/ROOT/examples/manual/filters/global.groovy new file mode 100644 index 0000000000..e0b6325cf2 --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/global.groovy @@ -0,0 +1,3 @@ +Throwable lastParam = parameters?.last() instanceof Throwable ? parameters.last() : null +Throwable actualThrowable = throwable ?: message?.throwable ?: lastParam +return actualThrowable instanceof DataAccessException \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/examples/manual/filters/local.groovy b/src/site/antora/modules/ROOT/examples/manual/filters/local.groovy new file mode 100644 index 0000000000..b87dc5faaf --- /dev/null +++ b/src/site/antora/modules/ROOT/examples/manual/filters/local.groovy @@ -0,0 +1 @@ +return logEvent.throwable instanceof DataAccessException; \ No newline at end of file diff --git a/src/site/antora/modules/ROOT/pages/manual/configuration.adoc b/src/site/antora/modules/ROOT/pages/manual/configuration.adoc index d5140872a3..a271a7719f 100644 --- a/src/site/antora/modules/ROOT/pages/manual/configuration.adoc +++ b/src/site/antora/modules/ROOT/pages/manual/configuration.adoc @@ -50,10 +50,13 @@ The order in which an extension will be searched for first depends on the order See <<configuration-factories>> for details. If no configuration file is found, Log4j Core uses the link:../javadoc/log4j-core/org/apache/logging/log4j/core/config/DefaultConfiguration.html[`DefaultConfiguration`] and the xref:manual/status-logger.adoc[status logger] prints a warning. -The default configuration prints all messages less specific than xref:manual/systemproperties.adoc#log4j2.level[`log4j2.level`] to the console. +The default configuration prints all messages less severe than xref:manual/systemproperties.adoc#log4j2.level[`log4j2.level`] to the console. -You can override the location of the configuration file using the xref:manual/systemproperties.adoc#log4j2.configurationFile[the `log4j2.configurationFile` system property]. -In such a case, Log4j Core will guess the configuration file format from the provided file name, or use the default configuration factory if the extension is unknown. +You can override the location of the configuration file +using the xref:manual/systemproperties.adoc#log4j2.configurationFile[`log4j2.configurationFile` +system property]. +In such a case, Log4j Core will guess the configuration file format from the provided file name, +or use the default configuration factory if the extension is unknown. There are certain *best-practices* we strongly recommend you to adapt in your Log4j configuration: @@ -287,7 +290,7 @@ include::example$manual/configuration/main-elements.properties[lines=17..-1] <2> Configures a file appender named `MAIN` with a JSON template layout. <3> Configures a file appender named `DEBUG_LOG` with a pattern layout. <4> Configures the root logger at level `INFO` and connects it to the `CONSOLE` and `MAIN` appenders. -The `CONSOLE` appender will only log messages less specific than `WARN`. +The `CONSOLE` appender will only log messages at least as severe as `WARN`. <5> Configures a logger named `"org.example"` at level `DEBUG` and connects it to the `DEBUG_LOG` appender. The logger is configured to forward messages to its parent (the root appender). @@ -334,6 +337,7 @@ Log4j allows the configuration of custom log-level names. + See xref:manual/customloglevels.adoc[Custom log level configuration] for details. +[#global-filters] Filters:: + Users can add Components to loggers, appender references, appenders, or the global configuration object to provide additional filtering of log events. @@ -566,8 +570,8 @@ xref:manual/architecture.adoc#logger-hierarchy[parent logger], for `Logger` and `AsyncLogger`. |=== -Specifies the level threshold that a log event must have to be logged. -Log events that are more specific than this setting will be filtered out. +It specifies the level threshold that a log event must have to be logged. +Log events that are less severe than this setting will be filtered out. See also xref:manual/filters.adoc#filters[Filters] if you require additional filtering. @@ -687,8 +691,8 @@ Specifies the name of the appender to use. | Type | link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] |=== -Specifies the level threshold that a log event must have to be logged. -Log events that are more specific than this setting will be filtered out. +It specifies the level threshold that a log event must have to be logged. +Log events that are less severe than this setting will be filtered out. [id=appenderrefs-elements-filters] === Filters diff --git a/src/site/antora/modules/ROOT/pages/manual/customloglevels.adoc b/src/site/antora/modules/ROOT/pages/manual/customloglevels.adoc index 67748f824b..e23d1c62c6 100644 --- a/src/site/antora/modules/ROOT/pages/manual/customloglevels.adoc +++ b/src/site/antora/modules/ROOT/pages/manual/customloglevels.adoc @@ -63,7 +63,7 @@ A level is composed of a case-sensitive name and a *priority* (of type `int`), w Priority can be used in several contexts to express a filtering capability, for instance: * `WARN` is _less severe_ than `ERROR` -* `WARN` is _more specific_ than `ERROR` +* `WARN` is _less specific_ than `ERROR` The entry point to log levels are through link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`]. Predefined levels are available for Log4j API integrators through link:../javadoc/log4j-api/org/apache/logging/log4j/spi/StandardLevel.html[`StandardLevel`]. diff --git a/src/site/antora/modules/ROOT/pages/manual/filters.adoc b/src/site/antora/modules/ROOT/pages/manual/filters.adoc index ad8eaeff12..903294bbbe 100644 --- a/src/site/antora/modules/ROOT/pages/manual/filters.adoc +++ b/src/site/antora/modules/ROOT/pages/manual/filters.adoc @@ -17,1038 +17,1407 @@ [id=filters] = Filters +:stem: -Log4j supports filtering of log events at each level of the logging pipeline using two features: +Filters are Log4j plugins that evaluate the parameters of a logging call or a log event and return one of three results: -* the `level` attributes that can be set on loggers and appender references, -* filter components that can be attached to loggers, appenders, appender references or the global configuration object. +ACCEPT:: The log event is accepted by the filter and goes to the next stage of the logging pipeline. -Filters evaluate the parameters of a logging call (context-wide filter) or a log event and return one of three results: +DENY:: The log event is unconditionally dropped. -ACCEPT:: The log event is accepted by the filter and goes to the next stage of the logging pipeline, +NEUTRAL:: Log4j behaves as if the filter was not present. -DENY:: The log event is unconditionally dropped, +Filters can be used at each level of the +xref:manual/architecture.adoc#architecture-diagram[logging pipeline]: -NEUTRAL:: Log4j behaves as if the filter was not present. +* the global configuration element can contain a xref:manual/configuration.adoc#global-filters[global filter]. +* each xref:manual/configuration.adoc#configuring-loggers[logger] configuration element can contain a xref:manual/configuration.adoc#logger-elements-filters[logger filter]. +* each xref:manual/configuration.adoc#configuring-appenderrefs[appender reference] configuration element can contain an xref:manual/configuration.adoc#appenderrefs-elements-filters[appender reference filter]. +* each xref:manual/appenders.adoc[appender] configuration element can contain an xref:manual/appenders.adoc[appender filter]. + +Additionally, the following configuration attributes take part in the filtering process: + +* the xref:manual/configuration.adoc#logger-attributes-level[`level` attribute] of logger configuration elements. +* the xref:manual/configuration.adoc#appenderref-attributes-level[`level` attribute] of appender reference configuration elements. + +[#filtering-process] +== Filtering process + +Due to the interaction of many elements, +the filtering process in Log4j is quite complex and can be divided in four stages: + +. <<logger-stage,`Logger` stage>> +. <<logger-config-stage,`LoggerConfig` stage>> +. <<appender-control-stage,`AppenderControl` stage>> +. <<appender-stage,`Appender` stage>> + +[IMPORTANT] +==== +For performance reasons, log events should be filtered at the earliest possible stage. +This reduces the cost of disabled log events: +e.g., log event creation, population of context data, formatting, transfer through an asynchronous barrier. +==== + +[#logger-stage] +=== 1. `Logger` stage + +[plantuml] +.... +@startuml +start +group Logger + +:A Logger method; + +switch (Apply global filter) +case (DENY) + #pink:Discard; + detach +case (ACCEPT) +case (NEUTRAL) + if (Is less severe than logger level?) then (yes) + #pink:Discard; + detach + else (no) + ' The label improves spacing + label a1 + endif +endswitch +end group +:Create LogEvent; +stop +.... + +The parameters of the logging call are passed to the global filter. +If the global filter returns: + +DENY:: The log message is immediately discarded. +NEUTRAL:: If the level of the log message is less severe than the configured logger threshold, the message is discarded. +Otherwise, a +link:../javadoc/log4j-core/org/apache/logging/log4j/core/LogEvent.html[`LogEvent`] is created and processing continues. +ACCEPT:: A `LogEvent` is created and processing continues in the next stage. + +[TIP] +==== +Filtering logging calls at this stage provides the best performance: + +* this stage precedes the creation of log events, therefore operations like the +xref:manual/thread-context.adoc[injection of context data], +xref:manual/layouts.adoc#LocationInformation[computation of location information] +will not be performed for disabled log statements. +* this stage precedes the asynchronous calls performed by either +xref:manual/async.adoc[asynchronous loggers] +or +xref:manual/appenders.adoc#AsyncAppender[asynchronous appenders]. +==== + +[#logger-config-stage] +=== 2. `LoggerConfig` stage + +[plantuml] +.... +@startuml +start +group LoggerConfig +repeat + +:LoggerConfig.log(); + +if (Apply logger filter) then (DENY) + #pink:Discard; + detach +else (not DENY) + ' The label improves spacing + label a1 +endif +repeat while (Go to parent logger?) is (yes) +-> no; +end group +stop +@enduml +.... + +In this stage, log events are evaluated by all the +xref:manual/configuration.adoc#logger-elements-filters[logger filters] +that stand on the path from the logger to an appender. +Due to the +xref:manual/configuration.adoc#logger-attributes-additivity[additivity of logger configurations], +this means that a log event must also pass the filters of all the parent loggers, +until it reaches the logger that references the chosen appender. + +[#appender-control-stage] +=== 3. `AppenderControl` stage + +[plantuml] +.... +@startuml +!pragma useVerticalIf on +start +group AppenderControl + +:AppenderControl.callAppender(); + +if (Is less severe then appender reference level?) then (yes) + #pink:Discard; + detach +else (no) + ' The label improves spacing + label a2 +endif +if (Apply appender reference filter) then (DENY) + #pink:Discard; + detach +else (not DENY) + ' The label improves spacing + label a1 +endif +end group +stop +@enduml +.... + +To pass this stage, log events must satisfy both conditions: + +* the log event must be at least as severe as the +xref:manual/configuration.adoc#appenderref-attributes-level[`level` attribute] +of the appender reference. +* the xref:manual/configuration.adoc#appenderrefs-elements-filters[appender reference filter] must return `ACCEPT` or `NEUTRAL`, + +[#appender-stage] +=== 4. `Appender` stage + +[plantuml] +.... +@startuml +start +group Appender + +:Appender.append(); + +if (Apply appender filter) then (DENY) + #pink:Discard; + detach +else (not DENY) + ' The label improves spacing + label a1 +endif +end group +#palegreen:Log message; +@enduml +.... + +When log events reach an appender, +the filter attached to an appender is evaluated and if the result is `DENY`, +the log event is discarded. + +[NOTE] +==== +Some appenders like the +xref:manual/appenders.adoc#AsyncAppender[asynchronous appender] +use appender references to transfer log events to other appenders. +In such a case, the filtering process goes back to the <<appender-control-stage,`AppenderControl` stage>>. +==== + +[TIP] +==== +Users migrating from Log4j 1 often replace the `threshold` property of a Log4j 1 appender with a <<ThresholdFilter>> on the equivalent Log4j 2 appender. + +Using the `level` property of appender references will give a better performance. +==== + +[WARNING] +==== +Configuring filters is a measure of last resort, +since it adds a large overhead to disabled log events. +You should rather configure the filtering in one of the previous stages. +==== -To decide whether a log event from a certain logger is delivered to a specific appender, the following procedure is followed: +[#example-configuration-file] +=== Example configuration file + +The following example shows the order in which filters are evaluated: [tabs] ==== XML:: + -.Snippet from an example {antora-examples-url}/manual/filters/filters.xml[`log4j2.xml`] [source,xml] ---- -include::example$manual/filters/filters.xml[lines=23..41,indent=0] +include::example$manual/filters/filters.xml[lines=1;18..-1] ---- JSON:: + -.Snippet from an example {antora-examples-url}/manual/filters/filters.json[`log4j2.json`] [source,json] ---- -include::example$manual/filters/filters.json[lines=3..35,indent=0] +include::example$manual/filters/filters.json[] ---- YAML:: + -.Snippet from an example {antora-examples-url}/manual/filters/filters.yaml[`log4j2.yaml`] [source,yaml] ---- -include::example$manual/filters/filters.yaml[lines=18..-1] +include::example$manual/filters/filters.yaml[lines=17..-1] ---- Properties:: + -.Snippet from an example {antora-examples-url}/manual/filters/filters.properties[`log4j2.properties`] [source,properties] ---- include::example$manual/filters/filters.properties[lines=17..-1] ---- ==== -<1> First the context-wide filter is consulted. -If it returns `ACCEPT` the log message goes directly to point 3. -<2> Then Log4j checks the message against the configured logger level. -<3> The filter configured on a logger is applied next. -If the logger is additive, the filter on the parent logger is applied recursively until we end up on the logger that references the given appender. -<4> Next comes the turn of the filter configured on an appender reference, -<5> followed by a level check against the configured level of the reference. -<6> The process ends with the filter attached to an appender. +<1> Global filter +<2> Logger `level` attribute (it is skipped if the event matches the global filter) +<3> Filter of the "org.example" logger +<4> Filter of the root logger (it is the parent of the "org.example" logger) +<5> Appender reference `level` attribute +<6> Filter of the appender reference +<7> Filter of the appender -[WARNING] -==== -For performance reasons, log events should be filtered as soon as possible in the logging pipeline. -This reduces the costs (formatting, transfer through an asynchronous barrier) of disabled log events. -==== +[#common-configuration] +== Common configuration -[TIP] -==== -Users migrating from Log4j 1 often replace the `threshold` property of a Log4j 1 appender with a <<ThresholdFilter>> on the equivalent Log4j 2 appender. +[#common-configuration-attributes] +=== Common configuration attributes -Using the `level` property of appender references will give a better performance. -==== +The default behavior of filters is in line with the `filter()` methods of functional interfaces, such as +https://docs.oracle.com/javase/{java-target-version}/docs/api/java/util/Optional.html#filter-java.util.function.Predicate-[`Optional.filter()`] +or +https://docs.oracle.com/javase/{java-target-version}/docs/api/java/util/stream/Stream.html#filter-java.util.function.Predicate-[`Stream.filter()`]: +filters pass matching events to the next filter and drop those that do not match. + +To allow for a larger spectrum of behaviors, +all standard filters, except `CompositeFilter` and `DenyAllFilter`, accept the following configuration attributes: + +.Common filter configuration attributes +[cols="1m,1,1,4"] +|=== +|Attribute |Type | Default value |Description + +| [[onMatch]]onMatch +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.Result.html[`Result`] +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.Result.html#NEUTRAL[`NEUTRAL`] +| Result returned if the condition matches. + +| [[onMismatch]]onMismatch +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.Result.html[`Result`] +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.Result.html#DENY[`DENY`] +| Result returned if the condition does not match. + +|=== + +[#CompositeFilter] +=== Composing filters + +Filters usually test for a single condition. +To express a more complex filtering logic, Log4j provides a +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-CompositeFilter[`Filters`] +plugin. +This plugin can contain a sequence of filters and has no other configuration option. + +The `Filters` plugin sequentially evaluates each sub-filter and: + +* if the sub-filter returns `ACCEPT` (resp. `DENY`), the `Filters` plugin returns `ACCEPT` (resp. `DENY`). +* if the sub-filter return `NEUTRAL`, the `Filters` plugin evaluates the next sub-filter in the chain. +* if the last sub-filter returns `NEUTRAL`, the `Filters` plugin returns `NEUTRAL`. + +The `Filters` plugin together with the ternary logic of filters, can be used to express all the boolean operators. +In the following examples `A` and `B` are two filters. + +`NOT A`:: +You can invert the functionality of filter `A` by swapping the `onMatch` and `onMismatch`: ++ +[source,xml] +---- +<A onMatch="DENY" onMismatch="NEUTRAL"/> +---- + +`A AND B`:: +To select the events that match both `A` and `B` you can use: ++ +[source,xml] +---- +<Filters> + <A/> + <B/> +</Filters> +---- + +`A OR B`:: +To select the events that match `A` or `B` we can replace `NEUTRAL` with `ACCEPT` in the `onMatch` attribute: ++ +[source,xml] +---- +<Filters> + <A onMatch="ACCEPT"/> + <B onMatch="ACCEPT"/> +</Filters> +---- + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-CompositeFilter[📖 Plugin reference for `Filters`] [#collection] == Collection -Log4j bundles several predefined filters to assist in several common deployment use cases. -Following sections explain all these in detail. +Log4j Core provides the following filters out-of-the-box. + +[#timestamp-filters] +=== Timestamp filters + +Timestamp filters use the timestamp of log events to decide whether to log them or not. [#BurstFilter] -=== BurstFilter +==== `BurstFilter` -The BurstFilter provides a mechanism to control the rate at which LogEvents are processed by silently discarding events after the maximum limit has been reached. +The `BurstFilter` uses the _sliding window log_ algorithm to limit the rate of log events. +The rate limit is only applied to log events less severe than a configured log level. -.Burst Filter Parameters -[cols="1m,1,4"] +Besides the common configuration attributes, +the `BurstFilter` supports the following parameters: + +.`BurstFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description - -|level -|String -|Level of messages to be filtered. Anything at or below -this level will be filtered out if `maxBurst` has been exceeded. The -default is WARN meaning any messages that are higher than warn will be -logged regardless of the size of a burst. - -|rate -|float -|The average number of events per second to allow. - -|maxBurst -|integer -|The maximum number of events that can occur before -events are filtered for exceeding the average rate. The default is 10 -times the rate. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +|Attribute | Type | Default value | Description + +| level +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#WARN[`WARN`] +| The rate limit only applies to log events less severe than this level. +Events at least as severe as this level will always match. + +| rate +| `float` +| `10` +| The average number of events per second to allow. + +| maxBurst +| `long` +| `10 × rate` +| The maximum number of events in a sliding window. + |=== -A configuration containing the BurstFilter might look like: +The sliding window can be easily computed as: -[source,xml] +[stem] +++++ +wi\ndow = (m\axBurst) / (rate), +++++ + +where `window` is the duration of the sliding window in seconds. + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-BurstFilter[📖 Plugin reference for `BurstFilter`] + +[#TimeFilter] +==== `TimeFilter` + +The `TimeFilter` only matches log events emitted during a certain time of the day. + +Besides the common configuration attributes, +the `TimeFilter` supports the following parameters: + +.`TimeFilter` -- configuration attributes +[cols="1m,2,1,4"] +|=== +| Attribute | Type | Default value | Description + +| start +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/LocalTime.html[`LocalTime`] in `HH:mm:ss` format +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/LocalTime.html#MIN[`LocalTime.MIN`] +| The beginning of the time slot. + +| start +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/LocalTime.html[`LocalTime`] in `HH:mm:ss` format +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/LocalTime.html#MAX[`LocalTime.MAX`] +| The end of the time slot. + +| timezone +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/ZoneId.html[`ZoneId`] +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/time/ZoneId.html#systemDefault--[`ZoneId.systemDefault()`] +| The timezone to use when comparing `start` and `end` to the event timestamp. + +|=== + +As a simple application of this filter, +if you want to forward messages to your console during work hours and to your e-mail account after work hours, +you can use a configuration snippet like: + +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/TimeFilter.xml[`log4j2.xml`] +[source,xml,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> +include::example$manual/filters/TimeFilter.xml[tag=filter] ---- -[#CompositeFilter] -=== CompositeFilter - -The CompositeFilter provides a way to specify more than one filter. -It is added to the configuration as a filter element and contains other filters to be evaluated. -The filter element accepts no parameters. +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/TimeFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/TimeFilter.json[tag=filter] +---- -A configuration containing the CompositeFilter might look like: +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/TimeFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/TimeFilter.yaml[tag=filter] +---- -[source,xml] +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/TimeFilter.properties[`log4j2.properties`] +[source,properties,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Filters> - <MarkerFilter marker="EVENT" onMatch="ACCEPT" onMismatch="NEUTRAL"/> - <DynamicThresholdFilter key="loginId" defaultThreshold="ERROR" - onMatch="ACCEPT" onMismatch="NEUTRAL"> - <KeyValuePair key="User1" value="DEBUG"/> - </DynamicThresholdFilter> - </Filters> - <Appenders> - <File name="Audit" fileName="logs/audit.log"> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - </File> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Logger name="EventLogger" level="info"> - <AppenderRef ref="Audit"/> - </Logger> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> +include::example$manual/filters/TimeFilter.properties[tag=filter] ---- +==== -[#DynamicThresholdFilter] -=== DynamicThresholdFilter +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-TimeFilter[📖 Plugin reference for `TimeFilter`] -The DynamicThresholdFilter allows filtering by log level based on specific attributes. -For example, if the user's loginId is being captured in the ThreadContext Map then it is possible to enable debug logging for only that user. -If the log event does not contain the specified ThreadContext item NEUTRAL will be returned. +[#level-filters] +=== Level filters -.Dynamic Threshold Filter Parameters -[cols="1m,1,4"] +The following filters allow you to filter log events based on their level. + +[#LevelMatchFilter] +==== `LevelMatchFilter` + +The `LevelMatchFilter` matches log events that have exactly a certain log level. + +Besides the common configuration attributes, the `LevelMatchFilter` supports the following parameter: + +.`LevelMatchFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description - -|key -|String -|The name of the item in the ThreadContext Map to compare. - -|defaultThreshold -|String -|Level of messages to be filtered. The default -threshold only applies if the log event contains the specified -ThreadContext Map item and its value do not match any key in the -key/value pairs. - -|keyValuePair -|KeyValuePair[] -|One or more KeyValuePair elements that -define the matching value for the key and the Level to evaluate when the -key matches. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Attribute | Type | Default value | Description + +| level +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#ERROR[`ERROR`] +| The filter only matches log events of this level. + |=== -Here is a sample configuration containing the DynamicThresholdFilter: +[TIP] +==== +If you wish to use a different log file for each log level, you can also use a +xref:manual/appenders.adoc#RoutingAppender[`Routing` appender] together with the +xref:manual/lookups.adoc#EventLookup[`${event:Level}` lookup]. +==== -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <DynamicThresholdFilter key="loginId" defaultThreshold="ERROR" - onMatch="ACCEPT" onMismatch="NEUTRAL"> - <KeyValuePair key="User1" value="DEBUG"/> - </DynamicThresholdFilter> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-LevelMatchFilter[📖 Plugin reference for `LevelMatchFilter`] [#LevelRangeFilter] -=== LevelRangeFilter +==== `LevelRangeFilter` + +The `LevelRangeFilter` matches log events with a log level within a configured range. -`LevelRangeFilter` allows filtering against a level range, where levels get compared by their associated integral values; `OFF` has an integral value of 0, `FATAL` 100, `ERROR` 200, and so on. +Besides the common configuration attributes, the `LevelRangeFilter` supports the following parameter: -.`LevelRangeFilter` parameters -[cols="1m,1m,4"] +.`LevelRangeFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description +| Attribute | Type | Default value | Description -|minLevel -|Level -|the minimum level threshold (defaults to `OFF`, which has an integral value of 0) +| minLevel +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#OFF[`OFF`] +| The filter only matches log events at most as severe as this level. -|maxLevel -|Level -|the maximum level threshold (defaults to `ALL`, which has an integral value of `Integer.MAX_VALUE`) +| maxLevel +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#ALL[`ALL`] +| The filter only matches log events at least as severe as this level. + +|=== -|onMatch -|Filter.Result -|the result to return on a match, where allowed values are `ACCEPT`, `DENY`, or `NEUTRAL` (default) +[TIP] +==== +Make sure not to invert the bounds of the range. +Starting from the smallest level, the Log4j API defines: `OFF`, `FATAL`, `ERROR`, `WARN`, `INFO`, `DEBUG`, `TRACE` and `ALL`. +==== -|onMismatch -|Filter.Result -|the result to return on a mismatch, where allowed values are `ACCEPT`, `DENY` (default), or `NEUTRAL` +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-LevelRangeFilter[📖 Plugin reference for `LevelRangeFilter`] + +[#ThresholdFilter] +==== `ThresholdFilter` + +The `ThresholdFilter` matches log events at least as severe as a configured level. + +Besides the common configuration attributes, the `ThresholdFilter` supports the following parameter: + +.`ThresholdFilter`—configuration attributes +[cols="1m,1,1,4"] |=== +| Attribute | Type | Default value | Description -In the following example configuration, a `LevelRangeFilter` is configured with `maxLevel` set to `INFO`. -The filter will return `onMismatch` result (i.e., `DENY`, the default) for log events of level with higher integral values than `INFO`; i.e., `DEBUG`, `TRACE`, etc. +| level +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#OFF[`OFF`] +| The filter only matches log events at least as severe as this level. -.Example configuration using `LevelRangeFilter` -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="WARN" name="MyApp"> - <Appenders> - <Console name="STDOUT"> - <LevelRangeFilter maxLevel="INFO"/> - <PatternLayout pattern="%d %p %c{1.} [%t] %m%n"/> - </Console> - </Appenders> - <Loggers> - <Root level="ERROR"> - <AppenderRef ref="STDOUT"/> - </Root> - </Loggers> -</Configuration> ----- +|=== -[#MapFilter] -=== MapFilter +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-ThresholdFilter[📖 Plugin reference for `ThresholdFilter`] + +[#DynamicThresholdFilter] +==== `DynamicThresholdFilter` + +The `DynamicThresholdFilter` is a variant of <<ThresholdFilter>>, +which uses a different threshold for each log event. +The effective threshold to use is determined by querying the +xref:manual/thread-context.adoc[context data] +of the log event. +For each log event: + +. The filter retrieves the value of `key` in the context data map. +. The filter checks the list of nested +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +configuration elements to decide which level to apply. -The MapFilter allows filtering against data elements that are in a MapMessage. +Besides the common configuration attributes, the `DynamicThresholdFilter` supports the following parameters: -.Map Filter Parameters +.`DynamicThresholdFilter`—configuration attributes +[cols="1m,1,1,4"] +|=== +| Attribute | Type | Default value | Description + +| key +| `String` +| +| The key to a value in the context map of the log event. + +**Required** + +| defaultThreshold +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html[`Level`] +| link:../javadoc/log4j-api/org/apache/logging/log4j/Level.html#ERROR[`ERROR`] +| Threshold to apply to log events that don't have a corresponding `KeyValuePair`. + +|=== + +.`DynamicThresholdFilter`—nested elements [cols="1m,1,4"] |=== -|Parameter Name |Type |Description - -|keyValuePair -|KeyValuePair[] -|One or more KeyValuePair elements that -define the key in the map and the value to match. If the same key is -specified more than once then the check for that key will automatically -be an "or" since a Map can only contain a single value. - -|operator -|String -|If the operator is "or" then a match by any one of -the key/value pairs will be considered to be a match, otherwise all the -key/value pairs must match. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Type | Multiplicity | Description + +| xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +| One or more +| Associates a log level with the context map value associated with `key`. + |=== -As in this configuration, the MapFilter can be used to log particular events: +For example, if `loginId` contains the login of the current user, +you can use this configuration to apply different thresholds to different users: -[source,xml] +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/DynamicThresholdFilter.xml[`log4j2.xml`] +[source,xml,indent=0] +---- +include::example$manual/filters/DynamicThresholdFilter.xml[tag=filter] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <MapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="eventId" value="Login"/> - <KeyValuePair key="eventId" value="Logout"/> - </MapFilter> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- - -This sample configuration will exhibit the same behavior as the preceding example since the only logger configured is the root. -[source,xml] +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/DynamicThresholdFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/DynamicThresholdFilter.json[tag=filter] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <MapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="eventId" value="Login"/> - <KeyValuePair key="eventId" value="Logout"/> - </MapFilter> - <AppenderRef ref="RollingFile"> - </AppenderRef> - </Root> - </Loggers> -</Configuration> ----- - -This third sample configuration will exhibit the same behavior as the preceding examples since the only logger configured is the root and the root is only configured with a single appender reference. -[source,xml] +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/DynamicThresholdFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"> - <MapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="eventId" value="Login"/> - <KeyValuePair key="eventId" value="Logout"/> - </MapFilter> - </AppenderRef> - </Root> - </Loggers> -</Configuration> +include::example$manual/filters/DynamicThresholdFilter.yaml[tag=filter] ---- +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/DynamicThresholdFilter.properties[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/DynamicThresholdFilter.properties[tag=filter] +---- +==== + +<1> If the `loginId` is `alice` a threshold level of `DEBUG` will be used. +<2> If the `loginId` is `bob` a threshold level of `INFO` will be used. +<3> For all the other values of `loginId` a threshold level of `ERROR` will be used. + +[TIP] +==== +You can use Log4j Core's +xref:manual/configuration.adoc#configuration-attribute-monitorInterval[automatic reconfiguration feature] +to modify the ``KeyValuePair``s without restarting your application. +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-DynamicThresholdFilter[📖 Plugin reference for `DynamicThresholdFilter`] + +[#marker-filters] +=== Marker filters + +The following filters use the +xref:manual/markers.adoc[log event marker] +to filter log events. + +[#NoMarkerFilter] +==== `NoMarkerFilter` + +The `NoMarkerFilter` matches log events that do not have any markers. + +This filter does not have any additional configuration attribute, except the common attributes. + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-NoMarkerFilter[📖 Plugin reference for `NoMarkerFilter`] + [#MarkerFilter] -=== MarkerFilter +==== `MarkerFilter` -The MarkerFilter compares the configured Marker value against the Marker that is included in the LogEvent. -A match occurs when the Marker name matches either the Log Event's Marker or one of its parents. +The `MarkerFilter` matches log events marked with a specific marker or **any** of its descendants. -.Marker Filter Parameters -[cols="1m,1,4"] +Besides the common configuration attributes, the `MarkerFilter` supports the following parameter: + +.`MarkerFilter`—configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description +|Attribute | Type | Default value | Description -|marker -|String -|The name of the Marker to compare. +| marker +| link:../javadoc/log4j-api/org/apache/logging/log4j/Marker.html[`Marker`] +| +| The filter only matches log events of marker with the given marker or one of its descendants. -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. +**Required** -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. |=== -A sample configuration that only allows the event to be written by the appender if the Marker matches: +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-MarkerFilter[📖 Plugin reference for `MarkerFilter`] -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <MarkerFilter marker="FLOW" onMatch="ACCEPT" onMismatch="DENY"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- +[#message-filters] +=== Message filters -[#MutableThreadContextMapFilter] -=== MutableThreadContextMapFilter +Message filters allow filtering log events based on the +xref:manual/messages.adoc[`Message`] +contained in the log event. -The MutableThreadContextMapFilter or MutableContextMapFilter allows filtering against data elements that are in the current context. -By default, this is the ThreadContext Map. -The values to compare are defined externally and can be periodically polled for changes. +include::partial$manual/log-event.adoc[] -.Mutable Context Map Filter Parameters -[cols="1m,1,4"] +[#RegexFilter] +==== `RegexFilter` + +The `RegexFilter` matches a regular expression against either the result of +link:../javadoc/log4j-api/org/apache/logging/log4j/message/Message.html#getFormat()[`Message.getFormat()`] +or +link:../javadoc/log4j-api/org/apache/logging/log4j/message/Message.html#getFormat()[`Message.getFormattedMessage()`]. +It can be used with all kinds of `Message` implementations. + +Besides the common configuration attributes, the `RegexFilter` supports the following parameters: + +.`RegexFilter` -- configuration attributes +[cols="1m,1,1,4"] +|=== +|Attribute | Type | Default value | Description + +| regex +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/util/regex/Pattern.html[`Pattern`] +| +| The regular expression used to match log messages. + +**Required** + +| useRawMsg +| `boolean` +| `false` +| If `true` the result of +link:../javadoc/log4j-api/org/apache/logging/log4j/message/Message.html#getFormat()[`Message.getFormat()`] +will be used. +Otherwise, +link:../javadoc/log4j-api/org/apache/logging/log4j/message/Message.html#getFormat()[`Message.getFormattedMessage()`] +is used. + +|=== + +[NOTE] +==== +This filter only matches if the **whole** log message matches the regular expression. +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-RegexFilter[📖 Plugin reference for `RegexFilter`] + +[#StringMatchFilter] +==== `StringMatchFilter` + +The `StringMatchFilter` matches a log event, if its message contains the given string. + +Besides the common configuration attributes, the `StringMatchFilter` supports the following parameters: + +.`StringMatchFilter`—configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description - -|configLocation -|String -|A file path or URI that points to the configuration. See below for a sample configuration. - -|operator -|String -|If the operator is "or" then a match by any one of -the key/value pairs will be considered to be a match, otherwise all the -key/value pairs must match. - -|pollInterval -|int -|The number of seconds to wait before checking to see if the configuration has been modified. When using HTTP or HTTPS the server must support the If-Modified-Since header and return a Last-Modified header containing the date and time the file was last modified. Note that by default only the https, file, and jar protocols are allowed. Support for other protocols can be enabled by specifying them in the `log4j2.Configuration.allowedProtocols` system property - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Attribute | Type | Default value | Description + +| text +| `String` +| +| The text to look for. + +**Required** + |=== -A sample configuration that only allows the event to be written by the appender if the Marker matches: +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-StringMatchFilter[📖 Plugin reference for `StringMatchFilter`] -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <MutableContextMapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or" - configLocation="http://localhost:8080/threadContextFilter.json"; pollInterval="300"/> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> ----- - -The configuration file supplied to the filter should look similar to: +[#map-filters] +=== Map filters + +The following filters match log events based on the content of one of these map structures: + +* The map contained in a +xref:manual/messages.adoc#MapMessage[`MapMessage`] object. +See +link:../javadoc/log4j-api/org/apache/logging/log4j/message/MapMessage.html#getData()[`MapMessage.getData()`] +for details. +* The context data map contained in a +link:../javadoc/log4j-core/org/apache/logging/log4j/core/LogEvent.html[`LogEvent`]. +See +link:../javadoc/log4j-core/org/apache/logging/log4j/core/LogEvent.html#getContextData()[`LogEvent.getContextData()`] +for details. + +[#configuration-map] +==== Configuration map + +These filters are configured with a configuration map of type `Map<String, String[]>`, +which, +depending on the filter, +is encoded as either JSON: [source,json] ---- -{ - "configs": { - "loginId": ["[email protected]", "[email protected]"], - "accountNumber": ["30510263"] - } -} +include::example$manual/filters/configs.json[] ---- -[#NoMarkerFilter] -=== NoMarkerFilter +or as a sequence of +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +plugins: + +[source,xml,indent=0] +---- +include::example$manual/filters/ContextMapFilter.xml[tag=kvp] +---- + +The configuration map associates to each key a list of allowed values for that key. +In the example above the allowed values for the `loginId` key are either `alice` or `bob`. +The only allowed value for the `clientId` key is `1234`. + +The map filters can work in two matching modes: + +[[matching-mode-and]] +AND:: +A map structure matches +if the value associated with **each** key +that appears in the configuration map is one of the allowed values. + +[[matching-mode-or]] +OR:: +A map structure matches +if the value associated with **at least one** key +that appears in the configuration map is one of the allowed values. + +[#MapFilter] +==== `MapFilter` + +The `MapFilter` allows filtering based on the contents of all +xref:manual/messages.adoc#collection-structured[structured ``Message``s]. -The NoMarkerFilter checks that there is no marker included in the LogEvent. -A match occurs when there is no marker in the Log Event. +This filter encodes the <<configuration-map>> introduced above as a list of +`KeyValuePair` elements. -.No Marker Filter Parameters -[cols="1m,1,3"] +Besides the common configuration attributes, the `MapFilter` supports the following parameters: + +.`MapFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description +| Attribute | Type | Default value | Description + +| operator +| _enumeration_ +| `AND` +a| Determines the matching mode of the filter. +Can be: -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. +* <<matching-mode-and,AND>> +* <<matching-mode-or,OR>> -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. |=== -A sample configuration that only allows the event to be written by the appender if no marker is there: +.`MapFilter` -- nested elements +[cols="1m,1,4"] +|=== +| Type | Multiplicity | Description -[source,xml] +| xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +| One or more +| Adds a value as allowed value for a key. +See <<configuration-map>> for more details. + +|=== + +For example, +if you want to filter all ``MapMessage``s +that have an `eventType` key with value `authentication` **and** an `eventId` key with value either `login` **or** `logout`, +you can use the following configuration: + +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MapFilter.xml[`log4j2.xml`] +[source,xml,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <NoMarkerFilter onMatch="ACCEPT" onMismatch="DENY"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> +include::example$manual/filters/MapFilter.xml[tag=filter] ---- -[#RegexFilter] -=== RegexFilter +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MapFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/MapFilter.json[tag=filter] +---- + +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MapFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/MapFilter.yaml[tag=filter] +---- + +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MapFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/MapFilter.properties[tag=filter] +---- +==== + +[TIP] +==== +You can use Log4j Core's +xref:manual/configuration.adoc#configuration-attribute-monitorInterval[automatic reconfiguration feature] +to modify the ``KeyValuePair``s without restarting your application. +==== -The RegexFilter allows the formatted or unformatted message to be compared against a regular expression. +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-MapFilter[📖 Plugin reference for `MapFilter`] + +[#StructuredDataFilter] +==== `StructuredDataFilter` -.Regex Filter Parameters +The `StructuredDataFilter` is a variant of <<MapFilter>> that only matches +xref:manual/messages.adoc#StructuredDataMessage[`StructureDataMessage`]s. + +In addition to matching the map structure contained in a `StructuredDataMessage` +(which corresponds to https://datatracker.ietf.org/doc/html/rfc5424#section-6.3.3[RFC 5424 `SD-PARAM` elements]) +it provides the following virtual keys: + +.`StructuredDataFilter` -- virtual keys [cols="1m,1,4"] |=== -|Parameter Name |Type |Description - -|regex -|String -|The regular expression. - -|useRawMsg -|boolean -|If true the unformatted message will be used, -otherwise, the formatted message will be used. The default value is -false. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Key | RFC5424 field | Description + +| id +| https://datatracker.ietf.org/doc/html/rfc5424#section-6.3.2[`SD-ID`] +| The +link:../javadoc/log4j-api/org/apache/logging/log4j/message/StructuredDataMessage.html#getId()[`id` field] +of the `StructuredDataMessage`. + +| id.name +| +| The +link:../javadoc/log4j-api/org/apache/logging/log4j/message/StructuredDataId.html#getName()[`name` field] +of the `StructuredDataId` element. + +| type +| https://datatracker.ietf.org/doc/html/rfc5424#section-6.2.7[`MSGID`] +| The +link:../javadoc/log4j-api/org/apache/logging/log4j/message/StructuredDataMessage.html#getType()[`type` field] +of a `StructuredDataMessage`. + +| message +| https://datatracker.ietf.org/doc/html/rfc5424#section-6.4[`MSG`] +| The result of a +link:../javadoc/log4j-api/org/apache/logging/log4j/message/Message.html#getFormat()[`Message.getFormat()`] method call. + |=== -A sample configuration that only allows the event to be written by the appender if it contains the word "test": +The `StructuredDataFilter` encodes the <<configuration-map>> introduced above as a list of +`KeyValuePair` and supports the following parameters, besides the common configuration attributes: -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <RegexFilter regex=".* test .*" onMatch="ACCEPT" onMismatch="DENY"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- - -[[Script]] -The ScriptFilter executes a script that returns true or false. - -.Script Filter Parameters -[cols="1m,1,4"] +.`StructuredDataFilter`—configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description +| Attribute | Type | Default value | Description -|script -|Script, ScriptFile or ScriptRef -|The Script element that specifies the logic to be executed. +| operator +| _enumeration_ +| `AND` +a| Determines the matching mode of the filter. +Can be: -|onMatch -|String -|Action to take when the script returns true. Can be -ACCEPT, DENY or NEUTRAL. The default value is NEUTRAL. +* <<matching-mode-and,AND>> +* <<matching-mode-or,OR>> -|onMismatch -|String -|Action to take when the filter returns false. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. |=== -.Script Parameters +.`StructuredDataFilter` -- nested elements [cols="1m,1,4"] |=== -|Parameter Name |Type |Description - -|configuration -|Configuration -|The Configuration that owns this -ScriptFilter. - -|level -|Level -|The logging Level associated with the event. Only present -when configured as a global filter. - -|loggerName -|String -|The name of the logger. Only present when -configured as a global filter. - -|logEvent -|LogEvent -|The LogEvent being processed. Not present when -configured as a global filter. - -|marker -|Marker -|The Marker passed on the logging call, if any. Only -present when configured as a global filter. - -|message -|Message -|The Message associated with the logging call. Only -present when configured as a global filter. - -|parameters -|Object[] -|The parameters passed to the logging call. Only -present when configured as a global filter. Some Messages include the -parameters as part of the Message. - -|throwable -|Throwable -|The Throwable passed to the logging call, if any. -Only present when configured as a global filter. Som Messages include -Throwable as part of the Message. - -|substitutor -|StrSubstitutor -|The StrSubstitutor is used to replace lookup variables. +| Type | Multiplicity | Description + +| xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +| One or more +| Adds a value as allowed value for a key. +See <<configuration-map>> for more details. + |=== -The sample below shows how to declare script fields and then reference them in specific components. -See -xref:manual/appenders.adoc#ScriptCondition[ScriptCondition] for an example of how the `ScriptPlugin` element can be used to embed script code directly in the configuration. +If you want +to match all log messages with an `SD-ID` equal to `authentication` and the value of the `userId` `SD-PARAM` equal to either `alice` or `bob`, +you can use the following configuration: -[source,xml] +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/StructuredDataFilter.xml[`log4j2.xml`] +[source,xml,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="ERROR"> - <Scripts> - <ScriptFile name="filter.js" language="JavaScript" path="src/test/resources/scripts/filter.js" charset="UTF-8" /> - <ScriptFile name="filter.groovy" language="groovy" path="src/test/resources/scripts/filter.groovy" charset="UTF-8" /> - </Scripts> - <Appenders> - <List name="List"> - <PatternLayout pattern="[%-5level] %c{1.} %msg%n"/> - </List> - </Appenders> - <Loggers> - <Logger name="TestJavaScriptFilter" level="trace" additivity="false"> - <AppenderRef ref="List"> - <ScriptFilter onMatch="ACCEPT" onMisMatch="DENY"> - <ScriptRef ref="filter.js" /> - </ScriptFilter> - </AppenderRef> - </Logger> - <Logger name="TestGroovyFilter" level="trace" additivity="false"> - <AppenderRef ref="List"> - <ScriptFilter onMatch="ACCEPT" onMisMatch="DENY"> - <ScriptRef ref="filter.groovy" /> - </ScriptFilter> - </AppenderRef> - </Logger> - <Root level="trace"> - <AppenderRef ref="List" /> - </Root> - </Loggers> -</Configuration> - +include::example$manual/filters/StructuredDataFilter.xml[tag=filter] ---- -[#StructuredDataFilter] -=== StructuredDataFilter +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/StructuredDataFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/StructuredDataFilter.json[tag=filter] +---- + +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/StructuredDataFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/StructuredDataFilter.yaml[tag=filter] +---- -The StructuredDataFilter is a MapFilter that also allows filtering on the event id, type and message. +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/StructuredDataFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/StructuredDataFilter.properties[tag=filter] +---- +==== -.StructuredData Filter Parameters -[cols="1m,1,4"] -|=== -|Parameter Name |Type |Description - -|keyValuePair -|KeyValuePair[] -|One or more KeyValuePair elements that -define the key in the map and the value to match on. "id", "id.name", -"type", and "message" should be used to match the StructuredDataId, -the name portion of the StructuredDataId, the type, and the formatted -message respectively. If the same key is specified more than once then -the check for that key will automatically be an "or" since a Map can -only contain a single value. - -|operator -|String -|If the operator is "or" then a match by any one of -the key/value pairs will be considered to be a match, otherwise all the -key/value pairs must match. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +[TIP] +==== +You can use Log4j Core's +xref:manual/configuration.adoc#configuration-attribute-monitorInterval[automatic reconfiguration feature] +to modify the ``KeyValuePair``s without restarting your application. +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-StructuredDataFilter[📖 Plugin reference for `StructuredDataFilter`] + +[#ContextMapFilter] +==== `ContextMapFilter` + +The `ContextMapFilter` works in the same way as the <<MapFilter>> above, +except it checks the +xref:manual/thread-context.adoc[context map data] +of the log event instead of the log message. + +This filter also encodes the <<configuration-map>> introduced above as a list of +`KeyValuePair` elements. + +Besides the common configuration attributes, the `ContextMapFilter` supports the following parameters: + +.`ContextMapFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== +| Attribute | Type | Default value | Description -As in this configuration, the StructuredDataFilter can be used to log particular events: +| operator +| _enumeration_ +| `AND` +a| Determines the matching mode of the filter. +Can be: -[source,xml] ----- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <StructuredDataFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="id" value="Login"/> - <KeyValuePair key="id" value="Logout"/> - </StructuredDataFilter> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- - -[#ThreadContextMapFilter] -=== ThreadContextMapFilter - -The ThreadContextMapFilter or ContextMapFilter allows filtering against data elements that are in the current context. -By default, this is the ThreadContext Map. - -.Context Map Filter Parameters +* <<matching-mode-and,AND>> +* <<matching-mode-or,OR>> + +|=== + +.`ContextMapFilter` -- nested elements [cols="1m,1,4"] |=== -|Parameter Name |Type |Description - -|keyValuePair -|KeyValuePair[] -|One or more KeyValuePair elements that -define the key in the map and the value to match. If the same key is -specified more than once then the check for that key will automatically -be an "or" since a Map can only contain a single value. - -|operator -|String -|If the operator is "or" then a match by any one of -the key/value pairs will be considered to be a match, otherwise all the -key/value pairs must match. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Type | Multiplicity | Description + +| xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-util-KeyValuePair[`KeyValuePair`] +| One or more +| Adds a value as allowed value for a key. +See <<configuration-map>> for more details. + |=== -A configuration containing the ContextMapFilter might look like: +For example, +if the `clientId` and `userId` keys in the context data map identify your client and his end users, +you can filter the log events generated by users `alice` and `bob` of client `1234` using this configuration: -[source,xml] +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ContextMapFilter.xml[`log4j2.xml`] +[source,xml,indent=0] +---- +include::example$manual/filters/ContextMapFilter.xml[tag=filter] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <ContextMapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="User1" value="DEBUG"/> - <KeyValuePair key="User2" value="WARN"/> - </ContextMapFilter> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> ----- - -The ContextMapFilter can also be applied to a logger for filtering: -[source,xml] +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ContextMapFilter.json[`log4j2.json`] +[source,json,indent=0] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <BurstFilter level="INFO" rate="16" maxBurst="100"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - <ContextMapFilter onMatch="ACCEPT" onMismatch="NEUTRAL" operator="or"> - <KeyValuePair key="foo" value="bar"/> - <KeyValuePair key="User2" value="WARN"/> - </ContextMapFilter> - </Root> - </Loggers> -</Configuration> - +include::example$manual/filters/ContextMapFilter.json[tag=filter] ---- -[#ThresholdFilter] -=== ThresholdFilter +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ContextMapFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/ContextMapFilter.yaml[tag=filter] +---- -This filter returns the onMatch result if the level in the LogEvent is the same or more specific than the configured level and the `onMismatch` -value otherwise. -For example, if the ThresholdFilter is configured with Level ERROR and the LogEvent contains Level DEBUG then the `onMismatch` -value will be returned since ERROR events are more specific than DEBUG. +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ContextMapFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/ContextMapFilter.properties[tag=filter] +---- +==== -.Threshold Filter Parameters -[cols="1m,1,4"] +[TIP] +==== +You can use Log4j Core's +xref:manual/configuration.adoc#configuration-attribute-monitorInterval[automatic reconfiguration feature] +to modify the ``KeyValuePair``s without restarting your application. +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-ThreadContextMapFilter[📖 Plugin reference for `ContextMapFilter`] + +[#MutableThreadContextMapFilter] +==== `MutableContextMapFilter` + +The `MutableContextMapFilter` is an alternative version of <<ContextMapFilter>> that also uses the +xref:manual/thread-context.adoc[context data map] +to filter messages, but externalizes the <<configuration-map>>, so it can be kept in a separate location. + +This filter encodes the <<configuration-map>> as JSON. +The configuration map must be stored in an **external** location and will be regularly polled for changes. + +Besides the common configuration attributes, the `MutableContextMapFilter` supports the following parameters: + +.`MutableContextMapFilter` -- configuration attributes +[cols="1m,1,1,4"] |=== -|Parameter Name |Type |Description +| Attribute | Type | Default value | Description + +| configLocation +| https://docs.oracle.com/javase/{java-target-version}/docs/api/java/nio/file/Path.html[`Path`] +or +https://docs.oracle.com/javase/{java-target-version}/docs/api/java/net/URI.html[`URI`] +| +| The location of the JSON <<configuration-map>>. + +**Required** -|level -|String -|A valid Level name to match. +| pollInterval +| `long` +| `0` +| +Determines the polling interval used by Log4j to check for changes to the configuration map. -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. +If set to `0`, polling is disabled. -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. |=== -A sample configuration that only allows the event to be written by the appender if the level matches: +[CAUTION] +==== +Unlike other map filters that have a configurable matching mode, +this filter always uses the <<matching-mode-or,OR>> matching mode. +==== -[source,xml] +To use this filter, you need to: + +. Create a JSON configuration map and place it at a known location (e.g. `++https://server.example/configs.json++`): ++ +[source,json] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <ThresholdFilter level="TRACE" onMatch="ACCEPT" onMismatch="DENY"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> +include::example$manual/filters/configs2.json[] ---- ++ +<1> The filter will match all events for client `1234` regardless of the `userId`. +<2> The filter will match all events for the `root` account regardless of the `clientId`. -[#TimeFilter] -=== TimeFilter +. Reference the configuration map location in your configuration file: ++ +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MutableContextMapFilter.xml[`log4j2.xml`] +[source,xml,indent=0] +---- +include::example$manual/filters/MutableContextMapFilter.xml[tag=filter] +---- + +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MutableContextMapFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/MutableContextMapFilter.json[tag=filter] +---- + +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MutableContextMapFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/MutableContextMapFilter.yaml[tag=filter] +---- + +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/MutableContextMapFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/MutableContextMapFilter.properties[tag=filter] +---- +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-MutableThreadContextMapFilter[📖 Plugin reference for `MutableContextMapFilter`] + +[#other-filters] +=== Other filters + +[#deny-filter] +==== `DenyFilter` + +The `DenyFilter` always returns `DENY`. +It does not support **any** configuration attribute, even the common configuration attributes. + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-DenyAllFilter[📖 Plugin reference for `DenyAllFilter`] + +[#Script] +==== `ScriptFilter` + +The `ScriptFilter` executes a script that must return `true` if the event matches and `false` otherwise. + +Besides the common configuration attributes, it accepts a single nested element: + +.`ScriptFilter` -- nested elements +[cols="3,1,4"] +|=== +| Type | Multiplicity | Description + +| +xref:manual/scripts.adoc#Script[`Script`], +xref:manual/scripts.adoc#ScriptFile[`ScriptFile`] +or +xref:manual/scripts.adoc#ScriptRef[`ScriptRef`] +| one +| A reference to the script to execute. + +See xref:manual/scripts.adoc[Scripts] for more details about scripting. +|=== -The time filter can be used to restrict the filter to only a certain portion of the day. +The bindings available to the script depend +on whether the `ScriptFilter` is used as a global filter in the <<logger-stage,Logger stage>> or in the remaining stages. +For global filters, the following bindings are available: -.Time Filter Parameters +.Script Bindings -- global filter [cols="1m,1,4"] |=== -|Parameter Name |Type |Description - -|start -|String -|A time in HH:mm:ss format. - -|end -|String -|A time in HH:mm:ss format. Specifying an end time less -than the start time will result in no log entries being written. - -|timezone -|String -|The timezone to use when comparing to the event -timestamp. - -|onMatch -|String -|Action to take when the filter matches. Can be ACCEPT, -DENY or NEUTRAL. The default value is NEUTRAL. - -|onMismatch -|String -|Action to take when the filter does not match. Can -be ACCEPT, DENY or NEUTRAL. The default value is DENY. +| Binding name | Type | Description + +| logger +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/Logger.html[`Logger`] +| The logger used in the log statement. + +| level +| xref:manual/customloglevels.adoc[`Level`] +| The level used in the log statement. + +| marker +| xref:manual/markers.adoc[`Marker`] +| The marker used in the log statement. + +| message +| xref:manual/messages.adoc[`Message`] +a| The message used in the log event if the user directly supplied one. +Otherwise: + +* If the logging statement contained an `Object` argument, it is wrapped in a +xref:manual/messages.adoc#ObjectMessage[`ObjectMessage`]. +* If the logging statement contained a format `String`, it is wrapped in a +xref:manual/messages.adoc#SimpleMessage[`SimpleMessage`]. + +| parameters +| `Object[]` +| The parameters passed to the logging call. +Some logging calls include the parameters as part of `message`. + +| throwable +| `Throwable` +| The `Throwable` passed to the logging call, if any. +Some logging calls include the `Throwable` as part of `message`. + +| substitutor +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/lookup/StrSubstitutor.html[`StrSubstitutor`] +| The `StrSubstitutor` used to replace lookup variables. + |=== -A sample configuration that only allows the event to be written by the appender from 5:00 to 5:30 am each day using the default timezone: +For the remaining filters, only these bindings are available: -[source,xml] +.Script Bindings -- internal filter +[cols="1m,1,4"] +|=== +| Binding name | Type | Description + +| logEvent +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/LogEvent.html[`LogEvent`] +| The LogEvent being processed. + +| substitutor +| link:../javadoc/log4j-core/org/apache/logging/log4j/core/lookup/StrSubstitutor.html[`StrSubstitutor`] +| The `StrSubstitutor` used to replace lookup variables. + + +|=== + +As an example, if you wish to match only log events that contain a certain exception, +you can use a simple Groovy script: + +.`scripts/local.groovy` +[source,groovy] +---- +include::example$manual/filters/local.groovy[] +---- + +You can then integrate the script in a Log4j configuration: + +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.xml[`log4j2.xml`] +[source,xml,indent=0] +---- +include::example$manual/filters/ScriptFilter.xml[tag=local] +---- + +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/ScriptFilter.json[tag=local] +---- + +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/ScriptFilter.yaml[tag=local] +---- + +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/ScriptFilter.properties[tag=local] ---- -<?xml version="1.0" encoding="UTF-8"?> -<Configuration status="warn" name="MyApp"> - <Appenders> - <RollingFile name="RollingFile" fileName="logs/app.log" - filePattern="logs/app-%d{MM-dd-yyyy}.log.gz"> - <TimeFilter start="05:00:00" end="05:30:00" onMatch="ACCEPT" onMismatch="DENY"/> - <PatternLayout> - <pattern>%d %p %c{1.} [%t] %m%n</pattern> - </PatternLayout> - <TimeBasedTriggeringPolicy /> - </RollingFile> - </Appenders> - <Loggers> - <Root level="error"> - <AppenderRef ref="RollingFile"/> - </Root> - </Loggers> -</Configuration> +==== + +Writing an equivalent **global** script is a little bit more complex, +since you need to take into account all the places where a throwable can be passed as a parameter. +The script becomes: + +.`scripts/global.groovy` +[source,groovy] +---- +include::example$manual/filters/global.groovy[] ---- +You can use it as a global filter: + +[tabs] +==== +XML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.xml[`log4j2.xml`] +[source,xml,indent=0] +---- +include::example$manual/filters/ScriptFilter.xml[tag=global] +---- + +JSON:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.json[`log4j2.json`] +[source,json,indent=0] +---- +include::example$manual/filters/ScriptFilter.json[tag=global] +---- + +YAML:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.yaml[`log4j2.yaml`] +[source,yaml,indent=0] +---- +include::example$manual/filters/ScriptFilter.yaml[tag=global] +---- + +Properties:: ++ +.Snippet from an example {antora-examples-url}/manual/filters/ScriptFilter.yaml[`log4j2.properties`] +[source,properties,indent=0] +---- +include::example$manual/filters/ScriptFilter.properties[tag=global] +---- +==== + +xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-filter-ScriptFilter[📖 Plugin reference for `ScriptFilter`] + [#extending] == Extending @@ -1069,8 +1438,12 @@ include::partial$manual/plugin-preliminaries.adoc[] [#extending-filters] === Extending filters -Filter are xref:manual/plugins.adoc[plugins] implementing link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.html[the `Filter` interface]. -We recommend users to extend from link:../javadoc/log4j-core/org/apache/logging/log4j/core/filter/AbstractFilter.html[`AbstractFilter`], which provides implementation convenience. +Filters are xref:manual/plugins.adoc[plugins] +implementing link:../javadoc/log4j-core/org/apache/logging/log4j/core/Filter.html[the `Filter` +interface]. +We recommend users +to extend from link:../javadoc/log4j-core/org/apache/logging/log4j/core/filter/AbstractFilter.html[`AbstractFilter`], +which provides implementation convenience. While annotating your filter with `@Plugin`, you need to make sure that * It has a unique `name` attribute across all available `Filter` plugins diff --git a/src/site/antora/modules/ROOT/pages/manual/messages.adoc b/src/site/antora/modules/ROOT/pages/manual/messages.adoc index 1c7ba84aef..187b6d37e0 100644 --- a/src/site/antora/modules/ROOT/pages/manual/messages.adoc +++ b/src/site/antora/modules/ROOT/pages/manual/messages.adoc @@ -106,7 +106,7 @@ Due to checks involved, `FormattedMessage` has an extra performance overhead com ==== [#LocalizedMessage] -==== LocalizedMessage +==== `LocalizedMessage` link:../javadoc/log4j-api/org/apache/logging/log4j/message/LocalizedMessage.html[`LocalizedMessage`] incorporates a `ResourceBundle`, and allows the message pattern parameter to be the key to the message pattern in the bundle. If no bundle is specified, `LocalizedMessage` will attempt to locate a bundle with the name of the `Logger` used to log the event. diff --git a/src/site/antora/modules/ROOT/pages/manual/scripts.adoc b/src/site/antora/modules/ROOT/pages/manual/scripts.adoc index eb25abcead..e231b8f70b 100644 --- a/src/site/antora/modules/ROOT/pages/manual/scripts.adoc +++ b/src/site/antora/modules/ROOT/pages/manual/scripts.adoc @@ -30,6 +30,7 @@ configuration property. Each component that allows scripts can contain on of the following configuration elements: +[[Script]] Script:: + This element specifies the content of the script directly and has: @@ -46,6 +47,7 @@ The element can be assigned a name using the `name` configuration attribute. See also xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-script-Script[Plugin reference]. +[[ScriptFile]] ScriptFile:: + This element points to an external script file and has: @@ -63,6 +65,7 @@ The element can be assigned a name using the `name` configuration attribute. See also xref:plugin-reference.adoc#org-apache-logging-log4j_log4j-core_org-apache-logging-log4j-core-script-ScriptFile[Plugin reference]. +[[ScriptRef]] ScriptRef:: + This element references a **named** script from the global diff --git a/src/site/antora/modules/ROOT/partials/manual/systemproperties/properties-async.adoc b/src/site/antora/modules/ROOT/partials/manual/systemproperties/properties-async.adoc index cbbcb4cfba..01f6386ff8 100644 --- a/src/site/antora/modules/ROOT/partials/manual/systemproperties/properties-async.adoc +++ b/src/site/antora/modules/ROOT/partials/manual/systemproperties/properties-async.adoc @@ -68,5 +68,5 @@ Discard:: when the queue is full, it drops the events whose level is equal or le |=== Determines the threshold level used by a `Discard` queue full policy. -Log events whose level is equal or less specific than the threshold level will be discarded during a queue full event. +Log events whose level is not more severe than the threshold level will be discarded during a queue full event. See also <<log4j2.asyncQueueFullPolicy>>.
