JVM profiling in combination with existing OpenTelemetry tracing instrumentation

[jstaffans]

Similar question to #4507:

is it possible to use this library only for profiling and JVM metrics, rely on the OpenTelemetry Java SDK for tracing instrumentation and have everything happily coexist in Datadog APM?

[richardstartin]

Yes, it is possible - you can just enable the profiler and metrics and disable the tracer (-Ddd.profiler.enabled=true -Ddd.jmxfetch.enabled=true -Ddd.tracing.enabled=false and you will get profiling and metrics without tracing. The metrics doesn't depend on the tracer being active at all. Profiling will work, however, there are a number of advanced profiling features which rely on context propagated by the tracer, which don't currently work with OTel, such as:

• code hotspots
• endpoint profiling
• labelling of profiling samples with span attributes
• currently unannounced profiling features

It may be possible to make these features work with OTel in the future.