ektravel commented on code in PR #14281:
URL: https://github.com/apache/druid/pull/14281#discussion_r1197947936
##########
docs/development/extensions-contrib/kafka-emitter.md:
##########
@@ -36,20 +36,28 @@ to monitor the status of your Druid cluster with this
extension.
All the configuration parameters for the Kafka emitter are under
`druid.emitter.kafka`.
-|property|description|required?|default|
-|--------|-----------|---------|-------|
-|`druid.emitter.kafka.bootstrap.servers`|Comma-separated Kafka broker.
(`[hostname:port],[hostname:port]...`)|yes|none|
-|`druid.emitter.kafka.metric.topic`|Kafka topic name for emitter's target to
emit service metric.|yes|none|
-|`druid.emitter.kafka.alert.topic`|Kafka topic name for emitter's target to
emit alert.|yes|none|
-|`druid.emitter.kafka.request.topic`|Kafka topic name for emitter's target to
emit request logs. If left empty then request logs will not be sent to the
Kafka topic.|no|none|
-|`druid.emitter.kafka.producer.config`|JSON formatted configuration which user
want to set additional properties to Kafka producer.|no|none|
-|`druid.emitter.kafka.clusterName`|Optional value to specify name of your
druid cluster. It can help make groups in your monitoring environment. |no|none|
+| property | description
| required? | default |
+|----------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|-----------------------|
+| `druid.emitter.kafka.bootstrap.servers` | Comma-separated Kafka
broker. (`[hostname:port],[hostname:port]...`)
| yes | none |
+| `druid.emitter.kafka.event.types` | Comma-separated event
types. <br/>Choices: alerts, metrics, requests, segmentMetadata
| no | ["metrics", "alerts"] |
+| `druid.emitter.kafka.metric.topic` | Kafka topic name for
emitter's target to emit service metric. If `event.types` contains `metrics`,
this field cannot be left empty
| no | none |
+| `druid.emitter.kafka.alert.topic` | Kafka topic name for
emitter's target to emit alert. If `event.types` contains `alerts`, this field
cannot be left empty
| no | none |
+| `druid.emitter.kafka.request.topic` | Kafka topic name for
emitter's target to emit request logs. If `event.types` contains `requests`,
this field cannot be left empty
| no | none |
+| `druid.emitter.kafka.segmentMetadata.topic` | Kafka topic name for
emitter's target to emit segments related metadata. If `event.types` contains
`segmentMetadata`, this field cannot be left empty
| no | none |
+| `druid.emitter.kafka.segmentMetadata.topic.format` | Format in which segment
related metadata will be emitted. <br/>Choices: json, protobuf.<br/> If set to
`protobuf`, then segment metadata is emitted in `DruidSegmentEvent.proto`
format | no | json |
+| `druid.emitter.kafka.producer.config` | JSON formatted
configuration which user want to set additional properties to Kafka producer.
| no | none |
+| `druid.emitter.kafka.clusterName` | Optional value to
specify name of your druid cluster. It can help make groups in your monitoring
environment.
| no | none |
### Example
```
druid.emitter.kafka.bootstrap.servers=hostname1:9092,hostname2:9092
-druid.emitter.kafka.metric.topic=druid-metric
+druid.emitter.kafka.event.types=["alerts", "requests", "segmentMetadata"]
druid.emitter.kafka.alert.topic=druid-alert
+druid.emitter.kafka.request.topic=druid-request-logs
+druid.emitter.kafka.segmentMetadata.topic=druid-segment-metadata
+druid.emitter.kafka.segmentMetadata.topic.format=protobuf
druid.emitter.kafka.producer.config={"max.block.ms":10000}
```
+Whenever `druid.emitter.kafka.segmentMetadata.topic.format` field is updated,
it is recommended to also update `druid.emitter.kafka.segmentMetadata.topic`
to avoid the same topic from getting polluted with different formats of segment
metadata.
Review Comment:
```suggestion
When you update `druid.emitter.kafka.segmentMetadata.topic.format`, it is
recommended that you also update `druid.emitter.kafka.segmentMetadata.topic`
to avoid the same topic from getting polluted with different formats of segment
metadata.
```
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