OpenTelemetry and new JFR events

[Robert Toyonaga]

Hello hotspot-jfr-dev!

I'm Robert on the Java monitoring team at Red Hat. I've been working on
building an OpenTelemetry metrics gatherer using JFR
<https://github.com/open-telemetry/opentelemetry-java-contrib/tree/main/jfr-streaming>.
The goal is to create an implementation that meets the OpenTelemetry
specification
<https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/semantic_conventions/runtime-environment-metrics.md#jvm-metrics>
outlining
metrics related to the JVM. The idea is to phase out and improve over the
JMX metrics gathering implementation. However, the set of existing JFR
events is missing a few data points required to accomplish this. I've
identified some additions that will help to fill in the gaps here
<https://docs.google.com/document/d/1oP8arX7FpZFnyA4nVi_k83eem7gh5w4_PJyPNZZFwRk/edit?usp=sharing>
.

If the changes seem reasonable, the first additions I'll try to make are
jdk.SerialGCHeapSummary and jdk.CPULinuxLoadAverage. Please let me know
what you think.

Thank you!
Robert Toyonaga
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