Added OpenTelemetry Java Agent for auto-instrumentation - #2082
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This adds the https://github.com/open-telemetry/opentelemetry-java-instrumentation agent jar to the container to allow tracing and metrics export without any code changes.
It can be enabled by setting the following environment variables:
see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/sdk-environment-variables.md for details on the settings.
Here's a complete Docker Compose setup:
View traces at http://localhost:16686/

see metrics in prometheus format at http://localhost:9464/

Closes #2066