How to configure opentelemetry using depedencies in spring boot microservices?

Question

Add dependency of opentelemetry jar in all the docker files Enable promethues for all spring microservices Enable/disable opentelemetry

I wanted to implement opentelemetry-javaagent dependency in my spring boot cloud project in every microservices. here they have used jar files and show the metrics on SigNoz but I wanted to use the dependency for opentelemetry.

The problem is I am getting dependency but they are not working. No metrics are being projected in the SigNoz dashboard.

Answer 1

If you don't want to use the agent, you may use the direct dependency in your application code.
https://mvnrepository.com/artifact/io.opentelemetry/opentelemetry-api.

<dependency>
    <groupId>io.opentelemetry</groupId>
    <artifactId>opentelemetry-api</artifactId>
</dependency>

And configure the SDK -

Resource resource = Resource.getDefault()
  .merge(Resource.create(Attributes.of(ResourceAttributes.SERVICE_NAME, "logical-service-name")));

SdkTracerProvider sdkTracerProvider = SdkTracerProvider.builder()
  .addSpanProcessor(BatchSpanProcessor.builder(OtlpGrpcSpanExporter.builder().build()).build())
  .setResource(resource)
  .build();

SdkMeterProvider sdkMeterProvider = SdkMeterProvider.builder()
  .registerMetricReader(PeriodicMetricReader.builder(OtlpGrpcMetricExporter.builder().build()).build())
  .setResource(resource)
  .build();

OpenTelemetry openTelemetry = OpenTelemetrySdk.builder()
  .setTracerProvider(sdkTracerProvider)
  .setMeterProvider(sdkMeterProvider)
  .setPropagators(ContextPropagators.create(W3CTraceContextPropagator.getInstance()))
  .buildAndRegisterGlobal();

Then acquire an instance of the tracer -

import io.opentelemetry.api;

//...

Tracer tracer =
    openTelemetry.getTracer("instrumentation-library-name", "1.0.0");

And create spans -

Span span = tracer.spanBuilder("my span").startSpan();

// Make the span the current span
try (Scope ss = span.makeCurrent()) {
  // In this scope, the span is the current/active span
} finally {
    span.end();
}

Taken from here -
https://opentelemetry.io/docs/instrumentation/java/manual/