Add metrics when history service writes activity task failed to even history

[dhiaayachi]

https://github.com/temporalio/temporal/blob/master/service/history/api/respondactivitytaskfailed/api.go#L124-L131

It would be imo useful to add counter metric here so that user can track how often service has failed activity for retries exhausted

[dhiaayachi]

Thanks for the feature request!

Right now, it's not possible to add a counter metric for failed retries but you can:

• Use the Temporal CLI to inspect individual Workflow Execution histories to see the retry count.
• Leverage custom metrics to track retries.
• Use the Temporal UI to view retry attempts.

Let me know if you have any other questions!