OpenTelemetry

Since Camel 3.5

The OpenTelemetry component is used for tracing and timing incoming and outgoing Camel messages using OpenTelemetry.

Events (spans) are captured for incoming and outgoing messages being sent to/from Camel.

Configuration

The configuration properties for the OpenTelemetry tracer are:

Option Default Description

excludePatterns

Sets exclude pattern(s) that will disable tracing for Camel messages that matches the pattern. The content is a Set<String> where the key is a pattern. The pattern uses the rules from Intercept.

encoding

false

Sets whether the header keys need to be encoded (connector specific) or not. The value is a boolean. Dashes need for instances to be encoded for JMS property keys.

Configuration

Include the camel-opentelemetry component in your POM, along with any specific dependencies associated with the chosen OpenTelemetry compliant Tracer.

To explicitly configure OpenTelemetry support, instantiate the OpenTelemetryTracer and initialize the camel context. You can optionally specify a Tracer, or alternatively it can be implicitly discovered using the Registry

OpenTelemetryTracer otelTracer = new OpenTelemetryTracer();
// By default it uses the DefaultTracer, but you can override it with a specific OpenTelemetry Tracer implementation.
otelTracer.setTracer(...);
// And then initialize the context
otelTracer.init(camelContext);

Spring Boot

If you are using Spring Boot then you can add the camel-opentelemetry-starter dependency, and turn on OpenTracing by annotating the main class with @CamelOpenTelemetry.

The OpenTelemetryTracer will be implicitly obtained from the camel context’s Registry, unless a OpenTelemetryTracer bean has been defined by the application.

Java Agent

Download the latest version.

This package includes the instrumentation agent as well as instrumentations for all supported libraries and all available data exporters. The package provides a completely automatic, out-of-the-box experience.

Enable the instrumentation agent using the -javaagent flag to the JVM.

java -javaagent:path/to/opentelemetry-javaagent.jar \
     -jar myapp.jar

By default, the OpenTelemetry Java agent uses OTLP exporter configured to send data to OpenTelemetry collector at http://localhost:4317.

Configuration parameters are passed as Java system properties (-D flags) or as environment variables. See the configuration documentation for the full list of configuration items. For example:

java -javaagent:path/to/opentelemetry-javaagent.jar \
     -Dotel.service.name=your-service-name \
     -Dotel.traces.exporter=jaeger \
     -jar myapp.jar

Spring Boot Auto-Configuration

When using opentelemetry with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-opentelemetry-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 2 options, which are listed below.

Name Description Default Type

camel.opentelemetry.encoding

Activate or deactivate dash encoding in headers (required by JMS) for messaging.

Boolean

camel.opentelemetry.exclude-patterns

Sets exclude pattern(s) that will disable tracing for Camel messages that matches the pattern.

Set

MDC Logging

When MDC Logging is enabled for the active Camel context the Trace ID and Span ID will be added and removed from the MDC for each route, the keys are trace_id and span_id, respectively.

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