Add Data Protection Metrics

[amcasey]

Is there an existing issue for this?

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Is your feature request related to a problem? Please describe the problem.

No response

Describe the solution you'd like

We should have KestrelMetrics-style metrics for Data Protection. In particular, we should have simple (vs up-down) counters for the most important error conditions, especially key-not-found.

Additional context

No response

[gfoidl]

We should have KestrelMetrics-style metrics for Data Protection.

Did you mean OTEL-style metrics? (😉)

especially key-not-found.

For easier diagnostics should this be expanded to add an (failure) event to Activity.Current?

[amcasey]

For easier diagnostics should this be expanded to add an (failure) event to Activity.Current?

@gfoidl Tell me more? I'm new to OTEL conventions.

[amcasey]

Personally, I think this is the highest ROI telemetry we could add, but there's some concern about whether it should be dotnet-wide or, conversely, whether this offers any value over log querying, so it's on hold for now.