26 lines
999 B
Markdown
26 lines
999 B
Markdown
---
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title: Kafka
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cSpell:ignore: Dotel
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---
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This is used as a message queue service to connect the checkout service with the
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accounting and fraud detection services.
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[Kafka service source](https://github.com/open-telemetry/opentelemetry-demo/blob/main/src/kafka/)
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## Auto-instrumentation
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This service relies on the OpenTelemetry Java agent and the built in
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[JMX Metric Insight Module](https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation/jmx-metrics/javaagent)
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to capture
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[Kafka broker metrics](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/instrumentation/jmx-metrics/javaagent/kafka-broker.md)
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and send them off to the collector via OTLP.
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The agent is passed into the process using the `-javaagent` command line
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argument. Command line arguments are added through the `KAFKA_OPTS` in the
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`Dockerfile`.
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```dockerfile
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ENV KAFKA_OPTS="-javaagent:/tmp/opentelemetry-javaagent.jar -Dotel.jmx.target.system=kafka-broker"
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```
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