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new 33334be36911 CAMEL-23706: Auto-configure in-memory OTel span exporter
for dev profile (#23817)
33334be36911 is described below
commit 33334be369115fc592bdac640c5bab830ffc2af3
Author: Claus Ibsen <[email protected]>
AuthorDate: Sun Jun 7 13:32:05 2026 +0200
CAMEL-23706: Auto-configure in-memory OTel span exporter for dev profile
(#23817)
* CAMEL-23706: camel-opentelemetry2 - Auto-configure in-memory span
exporter for dev profile
When the Camel profile is "dev" (default for JBang), auto-configure an
in-memory SpanExporter so OTel spans are captured locally without
requiring an external collector. A new dev console endpoint exposes the
captured spans as JSON for tooling access.
Co-Authored-By: Claude <[email protected]>
Signed-off-by: Claus Ibsen <[email protected]>
* CAMEL-23706: Document in-memory span exporter for dev profile
Signed-off-by: Claus Ibsen <[email protected]>
* CAMEL-23706: Add opentelemetry dev console to catalog
Signed-off-by: Claus Ibsen <[email protected]>
---------
Signed-off-by: Claus Ibsen <[email protected]>
Co-authored-by: Claude <[email protected]>
---
.../apache/camel/catalog/dev-consoles.properties | 1 +
.../camel/catalog/dev-consoles/opentelemetry.json | 15 +++
.../apache/camel/dev-console/opentelemetry.json | 15 +++
.../org/apache/camel/dev-console/opentelemetry | 2 +
.../org/apache/camel/dev-consoles.properties | 7 ++
.../src/main/docs/opentelemetry2.adoc | 37 ++++++
.../camel/opentelemetry2/DevSpanExporter.java | 91 ++++++++++++++
.../opentelemetry2/OpenTelemetryDevConsole.java | 131 +++++++++++++++++++++
.../camel/opentelemetry2/OpenTelemetryTracer.java | 35 ++++++
9 files changed, 334 insertions(+)
diff --git
a/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles.properties
b/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles.properties
index 8804844e3cf7..b993922f1751 100644
---
a/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles.properties
+++
b/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles.properties
@@ -32,6 +32,7 @@ main-http-server
memory
message-history
micrometer
+opentelemetry
platform-http
processor
producer
diff --git
a/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles/opentelemetry.json
b/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles/opentelemetry.json
new file mode 100644
index 000000000000..a29fc885c3d8
--- /dev/null
+++
b/catalog/camel-catalog/src/generated/resources/org/apache/camel/catalog/dev-consoles/opentelemetry.json
@@ -0,0 +1,15 @@
+{
+ "console": {
+ "kind": "console",
+ "group": "camel",
+ "name": "opentelemetry",
+ "title": "OpenTelemetry Spans",
+ "description": "OpenTelemetry span data captured in dev mode",
+ "deprecated": false,
+ "javaType": "org.apache.camel.opentelemetry2.OpenTelemetryDevConsole",
+ "groupId": "org.apache.camel",
+ "artifactId": "camel-opentelemetry2",
+ "version": "4.21.0-SNAPSHOT"
+ }
+}
+
diff --git
a/components/camel-opentelemetry2/src/generated/resources/META-INF/org/apache/camel/dev-console/opentelemetry.json
b/components/camel-opentelemetry2/src/generated/resources/META-INF/org/apache/camel/dev-console/opentelemetry.json
new file mode 100644
index 000000000000..a29fc885c3d8
--- /dev/null
+++
b/components/camel-opentelemetry2/src/generated/resources/META-INF/org/apache/camel/dev-console/opentelemetry.json
@@ -0,0 +1,15 @@
+{
+ "console": {
+ "kind": "console",
+ "group": "camel",
+ "name": "opentelemetry",
+ "title": "OpenTelemetry Spans",
+ "description": "OpenTelemetry span data captured in dev mode",
+ "deprecated": false,
+ "javaType": "org.apache.camel.opentelemetry2.OpenTelemetryDevConsole",
+ "groupId": "org.apache.camel",
+ "artifactId": "camel-opentelemetry2",
+ "version": "4.21.0-SNAPSHOT"
+ }
+}
+
diff --git
a/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-console/opentelemetry
b/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-console/opentelemetry
new file mode 100644
index 000000000000..578d2605e15f
--- /dev/null
+++
b/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-console/opentelemetry
@@ -0,0 +1,2 @@
+# Generated by camel build tools - do NOT edit this file!
+class=org.apache.camel.opentelemetry2.OpenTelemetryDevConsole
diff --git
a/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-consoles.properties
b/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-consoles.properties
new file mode 100644
index 000000000000..ab2c1c412824
--- /dev/null
+++
b/components/camel-opentelemetry2/src/generated/resources/META-INF/services/org/apache/camel/dev-consoles.properties
@@ -0,0 +1,7 @@
+# Generated by camel build tools - do NOT edit this file!
+dev-consoles=opentelemetry
+groupId=org.apache.camel
+artifactId=camel-opentelemetry2
+version=4.21.0-SNAPSHOT
+projectName=Camel :: Opentelemetry 2
+projectDescription=Implementation of Camel Opentelemetry based on the Camel
Telemetry spec
diff --git a/components/camel-opentelemetry2/src/main/docs/opentelemetry2.adoc
b/components/camel-opentelemetry2/src/main/docs/opentelemetry2.adoc
index 5d66034680c4..9179c7bb1547 100644
--- a/components/camel-opentelemetry2/src/main/docs/opentelemetry2.adoc
+++ b/components/camel-opentelemetry2/src/main/docs/opentelemetry2.adoc
@@ -52,6 +52,43 @@ When starting your application, you may also need to
configure OpenTelemetry SDK
java -Dotel.metrics.exporter=none -Dotel.logs.exporter=none -jar my-app.jar
----
+=== Dev Profile (In-Memory Span Exporter)
+
+When the Camel profile is set to `dev` (the default for Camel JBang), the
component automatically configures
+an in-memory span exporter. This captures OTel spans locally without requiring
an external collector such as
+Jaeger or an OpenTelemetry Collector.
+
+This is useful during development when you want to inspect traces via the dev
console or local tooling
+without setting up external infrastructure.
+
+With Camel JBang, enable it with the `--observe` flag:
+
+[source,bash]
+----
+camel run my-route.yaml --observe
+----
+
+The captured spans are available through the dev console at
`/q/dev/opentelemetry`:
+
+[source,bash]
+----
+# Summary (span count, capacity)
+curl http://localhost:8080/q/dev/opentelemetry
+
+# Full span data as JSON
+curl http://localhost:8080/q/dev/opentelemetry?dump=true
+
+# Limit the number of returned spans
+curl http://localhost:8080/q/dev/opentelemetry?dump=true&limit=50
+----
+
+The in-memory exporter holds up to 500 spans with oldest-first eviction. When
the buffer is full,
+the oldest spans are discarded to make room for new ones.
+
+NOTE: The in-memory exporter is only activated when the Camel profile is `dev`
and no user-provided
+OTel `Tracer` bean is registered. For production deployments, configure a
proper span exporter
+(OTLP, Jaeger, Zipkin, etc.).
+
[[OpenTelemetry-JavaAgent]]
=== Using the OpenTelemetry Java Agent
diff --git
a/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/DevSpanExporter.java
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/DevSpanExporter.java
new file mode 100644
index 000000000000..3dfca59782a5
--- /dev/null
+++
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/DevSpanExporter.java
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.opentelemetry2;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Queue;
+import java.util.concurrent.LinkedBlockingQueue;
+
+import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.trace.data.SpanData;
+import io.opentelemetry.sdk.trace.export.SpanExporter;
+
+/**
+ * In-memory {@link SpanExporter} for development use. Stores finished spans
in a bounded queue so they can be queried
+ * by the dev console and other local tooling.
+ *
+ * Auto-configured by {@link OpenTelemetryTracer} when the Camel profile is
"dev".
+ */
+final class DevSpanExporter implements SpanExporter {
+
+ static final int DEFAULT_CAPACITY = 500;
+
+ private final Queue<SpanData> spans;
+ private final int capacity;
+ private volatile boolean stopped;
+
+ DevSpanExporter() {
+ this(DEFAULT_CAPACITY);
+ }
+
+ DevSpanExporter(int capacity) {
+ this.capacity = capacity;
+ this.spans = new LinkedBlockingQueue<>(capacity);
+ }
+
+ @Override
+ public CompletableResultCode export(Collection<SpanData> spanDataList) {
+ if (stopped) {
+ return CompletableResultCode.ofSuccess();
+ }
+ for (SpanData span : spanDataList) {
+ while (!spans.offer(span)) {
+ spans.poll();
+ }
+ }
+ return CompletableResultCode.ofSuccess();
+ }
+
+ @Override
+ public CompletableResultCode flush() {
+ return CompletableResultCode.ofSuccess();
+ }
+
+ @Override
+ public CompletableResultCode shutdown() {
+ stopped = true;
+ return CompletableResultCode.ofSuccess();
+ }
+
+ List<SpanData> getFinishedSpans() {
+ return new ArrayList<>(spans);
+ }
+
+ int getSpanCount() {
+ return spans.size();
+ }
+
+ int getCapacity() {
+ return capacity;
+ }
+
+ void reset() {
+ spans.clear();
+ }
+}
diff --git
a/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryDevConsole.java
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryDevConsole.java
new file mode 100644
index 000000000000..42059cbe85c1
--- /dev/null
+++
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryDevConsole.java
@@ -0,0 +1,131 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.opentelemetry2;
+
+import java.util.List;
+import java.util.Map;
+
+import io.opentelemetry.sdk.trace.data.SpanData;
+import org.apache.camel.spi.annotations.DevConsole;
+import org.apache.camel.support.CamelContextHelper;
+import org.apache.camel.support.console.AbstractDevConsole;
+import org.apache.camel.util.json.JsonArray;
+import org.apache.camel.util.json.JsonObject;
+
+@DevConsole(name = "opentelemetry", displayName = "OpenTelemetry Spans",
+ description = "OpenTelemetry span data captured in dev mode")
+public class OpenTelemetryDevConsole extends AbstractDevConsole {
+
+ public static final String DUMP = "dump";
+ public static final String LIMIT = "limit";
+
+ public OpenTelemetryDevConsole() {
+ super("camel", "opentelemetry", "OpenTelemetry Spans",
+ "OpenTelemetry span data captured in dev mode");
+ }
+
+ @Override
+ protected String doCallText(Map<String, Object> options) {
+ DevSpanExporter exporter = findExporter();
+ if (exporter == null) {
+ return "OpenTelemetry in-memory exporter is not enabled (requires
dev profile)\n";
+ }
+
+ String dump = (String) options.get(DUMP);
+ if (dump != null) {
+ int limit = Integer.parseInt((String) options.getOrDefault(LIMIT,
"100"));
+ List<SpanData> spans = exporter.getFinishedSpans();
+ int start = Math.max(0, spans.size() - limit);
+ StringBuilder sb = new StringBuilder();
+ for (int i = start; i < spans.size(); i++) {
+ SpanData span = spans.get(i);
+ long durationMs = (span.getEndEpochNanos() -
span.getStartEpochNanos()) / 1_000_000;
+ sb.append(String.format(" TraceId: %s SpanId: %s Name: %s
Kind: %s Status: %s Duration: %dms%n",
+ span.getTraceId(), span.getSpanId(), span.getName(),
+ span.getKind(), span.getStatus().getStatusCode(),
durationMs));
+ }
+ return sb.toString();
+ }
+
+ StringBuilder sb = new StringBuilder();
+ sb.append("Enabled: true\n");
+ sb.append(String.format("Span Count: %d%n", exporter.getSpanCount()));
+ sb.append(String.format("Capacity: %d%n", exporter.getCapacity()));
+ return sb.toString();
+ }
+
+ @Override
+ protected JsonObject doCallJson(Map<String, Object> options) {
+ JsonObject root = new JsonObject();
+
+ DevSpanExporter exporter = findExporter();
+ if (exporter == null) {
+ root.put("enabled", false);
+ return root;
+ }
+
+ root.put("enabled", true);
+
+ String dump = (String) options.get(DUMP);
+ if (dump != null) {
+ int limit = Integer.parseInt((String) options.getOrDefault(LIMIT,
"100"));
+ List<SpanData> spans = exporter.getFinishedSpans();
+ int start = Math.max(0, spans.size() - limit);
+
+ JsonArray arr = new JsonArray();
+ for (int i = start; i < spans.size(); i++) {
+ arr.add(spanToJson(spans.get(i)));
+ }
+ root.put("spans", arr);
+ } else {
+ root.put("spanCount", exporter.getSpanCount());
+ root.put("capacity", exporter.getCapacity());
+ }
+
+ return root;
+ }
+
+ private DevSpanExporter findExporter() {
+ return CamelContextHelper.findSingleByType(getCamelContext(),
DevSpanExporter.class);
+ }
+
+ @SuppressWarnings("unchecked")
+ private static JsonObject spanToJson(SpanData span) {
+ JsonObject jo = new JsonObject();
+ jo.put("traceId", span.getTraceId());
+ jo.put("spanId", span.getSpanId());
+ String parentSpanId = span.getParentSpanId();
+ if (parentSpanId != null && !parentSpanId.isEmpty()
+ && !"0000000000000000".equals(parentSpanId)) {
+ jo.put("parentSpanId", parentSpanId);
+ }
+ jo.put("name", span.getName());
+ jo.put("kind", span.getKind().name());
+ jo.put("status", span.getStatus().getStatusCode().name());
+ jo.put("startEpochNanos", span.getStartEpochNanos());
+ jo.put("endEpochNanos", span.getEndEpochNanos());
+ jo.put("durationMs", (span.getEndEpochNanos() -
span.getStartEpochNanos()) / 1_000_000);
+
+ JsonObject attrs = new JsonObject();
+ span.getAttributes().forEach((key, value) -> attrs.put(key.getKey(),
value));
+ if (!attrs.isEmpty()) {
+ jo.put("attributes", attrs);
+ }
+
+ return jo;
+ }
+}
diff --git
a/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryTracer.java
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryTracer.java
index ed810c4f66e4..3996e8a24ad6 100644
---
a/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryTracer.java
+++
b/components/camel-opentelemetry2/src/main/java/org/apache/camel/opentelemetry2/OpenTelemetryTracer.java
@@ -24,9 +24,13 @@ import io.opentelemetry.api.baggage.Baggage;
import io.opentelemetry.api.trace.SpanBuilder;
import io.opentelemetry.api.trace.SpanKind;
import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.api.trace.propagation.W3CTraceContextPropagator;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.propagation.ContextPropagators;
import io.opentelemetry.context.propagation.TextMapGetter;
+import io.opentelemetry.sdk.OpenTelemetrySdk;
+import io.opentelemetry.sdk.trace.SdkTracerProvider;
+import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.api.management.ManagedResource;
import org.apache.camel.spi.Configurer;
@@ -49,12 +53,19 @@ public class OpenTelemetryTracer extends
org.apache.camel.telemetry.Tracer {
private Tracer tracer;
private ContextPropagators contextPropagators;
+ private OpenTelemetrySdk devSdk;
@Override
protected void initTracer() {
if (tracer == null) {
this.tracer =
CamelContextHelper.findSingleByType(getCamelContext(), Tracer.class);
}
+ if (tracer == null) {
+ String profile =
getCamelContext().getCamelContextExtension().getProfile();
+ if ("dev".equals(profile)) {
+ initDevSpanExporter();
+ }
+ }
if (tracer == null) {
this.tracer = GlobalOpenTelemetry.get().getTracer("camel");
}
@@ -79,6 +90,21 @@ public class OpenTelemetryTracer extends
org.apache.camel.telemetry.Tracer {
getCamelContext().getCamelContextExtension().addInterceptStrategy(interceptStrategy);
}
+ private void initDevSpanExporter() {
+ DevSpanExporter exporter = new DevSpanExporter();
+ SdkTracerProvider tracerProvider = SdkTracerProvider.builder()
+ .addSpanProcessor(SimpleSpanProcessor.create(exporter))
+ .build();
+ devSdk = OpenTelemetrySdk.builder()
+
.setPropagators(ContextPropagators.create(W3CTraceContextPropagator.getInstance()))
+ .setTracerProvider(tracerProvider)
+ .build();
+ this.tracer = devSdk.getTracer("camel");
+ this.contextPropagators = devSdk.getPropagators();
+ getCamelContext().getRegistry().bind("DevSpanExporter", exporter);
+ LOG.info("OpenTelemetry in-memory span exporter enabled (dev
profile)");
+ }
+
void setTracer(Tracer tracer) {
this.tracer = tracer;
}
@@ -93,6 +119,15 @@ public class OpenTelemetryTracer extends
org.apache.camel.telemetry.Tracer {
LOG.info("Opentelemetry2 enabled");
}
+ @Override
+ protected void doShutdown() {
+ super.doShutdown();
+ if (devSdk != null) {
+ devSdk.close();
+ devSdk = null;
+ }
+ }
+
private class OpentelemetrySpanLifecycleManager implements
SpanLifecycleManager {
private final static String BAGGAGE_VAR_PREFIX = "OTEL_BAGGAGE_";
