1866543 - Add telemetry support to error handling

Status: NEW

(Application Services :: General, enhancement, P3)

Description

[Mark Hammond [:markh] [:mhammond]]

From github: https://github.com/mozilla/application-services/issues/5253.

We're at the point where we have expected errors that we don't think are really worth reporting to Sentry, but seem like they would be worth tracking in telemetry (#5237). I think we should add a system like this to handle them:

• Add a new ApplicationErrorMetrics callback interface with a void count_error(string type_name) method to errorsupport.udl
• Add a support/error/metrics.yaml file with a single labeled counter metric.
• In our android wrapper code, we implement ApplicationErrorMetrics by incrementing the Glean counter with the error type, and add a method that Fenix can call to hook it up.

It would be way nicer to do all this in Rust, but I don't think we should wait for that.

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