OTEL implementation, so far matching EventCounters infrastructure.

[cincuranet]

Fixes #25880

[roji]

@cincuranet @SamMonoRT I know I'm behind on reviewing this, it's high on my list and moving up - early next week for sure.

[adityamandaleeka]

@cincuranet I just noticed I was marked as a reviewer on this PR. Is there any specific input you'd like me to provide? I don't have a ton of context on efcore.

[SamMonoRT]

@cincuranet I just noticed I was marked as a reviewer on this PR. Is there any specific input you'd like me to provide? I don't have a ton of context on efcore.

Was mostly if you saw patterns from other Aspire OTEL efforts.

[roji]

@cincuranet answered some questions above.

[noahfalk]

Could you also add documentation about these counters to https://learn.microsoft.com/en-us/dotnet/core/diagnostics/built-in-metrics please? :)

Those docs are a major way for customers to discover what metrics the .NET platform is providing to them.

[cincuranet]

@noahfalk WILCO

[noahfalk]

Thanks! 👍