EventCounter -> Metric API instrumentation

[cijothomas]

An EventCounter listener which can get metrics emitted using EventCounter, and in-turn invoke the new Metric API. https://docs.microsoft.com/dotnet/core/diagnostics/event-counters

[cijothomas]

@hananiel Assigning this to you since you mentioned interest in contributing this!

[tomkerkhove]

Is the current plan to have this in the GA version or only coming later (which is fine)?

[cijothomas]

This is not part of the API/SDK. This will likely be hosted in the -contrib repo, but no timelines yet. (One good thing is, we are not likely blocked by semantic conventions for the stable release of this, once code is ready)

[tomkerkhove]

Sounds good, thanks for sharing!

[twenzel]

Looking forward!

[mic-max]

I am working on making this instrumentation more stable. I will be

• Add / enable testing
• Cleaning up implementation
• Looking into different possible bad scenarios, like enabling the extension twice on the same provider
• Filtering out metrics covered by other instrumentation (Runtime, Process)
  • Ensure it works in conjunction with other instrumentation so none of the events will be lost
• Checking for memory leaks and minimize memory footprint as it will be enabled for the full lifetime of most applications that use it
  • Don't allocate memory after startup