.NET docs to include metrics emitted by extensions

[xakep139]

See #4482 (comment) and #4482 (comment) for details
Tl;DR: we need to update dotnet/docs#37213 with metric/instrument names that our components emit.
Additionally, ResourceMonitoring metrics need to be marked as experimental.

[joperezr]

Thanks for logging this @xakep139. I'm assuming this is one we need for November so I've marked it as such. Given you are working on making sure all of the telemetry is aligned, is this something you were planning on working on next?

[joperezr]

This one we want to make sure we have for November.

[joperezr]

Update:

• Once the PR with final instruments is done, @xakep139 will look into this one.

[xakep139]

@iliar-turdushev the full list of metrics with their attributes/tags is listed in #4482 (comment)

[davidfowl]

cc @IEvangelist