Add OpenTelemetry Instrumentation to Java Functions

[timoguin]

Add OpenTelemetry instrumentation by consuming the AWS Distro for OpenTelemetry as a Lambda layer.

How

AWS publishes Lambda layers that can be easily pulled in via the Layers property of any Lambda function. Add the relevant (regional) layer, set the AWS_LAMBDA_EXEC_WRAPPER env var, and enable active tracing.

I've included two references below. One includes full auto-instrumentation for Java. The second instruments the AWS Java SDK only, while any additional instrumentation is on the implementor and would require code changes.

References

• https://aws-otel.github.io/docs/getting-started/lambda/lambda-java-auto-instr
• https://aws-otel.github.io/docs/getting-started/lambda/lambda-java