(This question predates version 2.13.0 but the warning given is the same)

If you're using opentelemetry-javaagent version 2.13.0 there's a bug that causes lots of these warning logs.

It's fixed in version 2.13.1. https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.13.1

Backport: Fix double instrumentation of Java runtime metrics