[Telemetry Audit] Move reader mode probes to their own reader_mode.yaml file

[data-sync-user]

The Task

This task is to move the reader mode probes out of the monolithic metrics.yaml file and into their own YAML file with a ReaderMode tag.

You can use the FirefoxTelemetryUtility.sh script to create a new reader_mode file.

More instructions on using the script can be found in our wiki: https://github.com/mozilla-mobile/firefox-ios/wiki/Adding-Glean-Telemetry-Events-and-Metrics#a-update-the-telemetry-specification-yaml-files

You can look up these probes in the Glean dictionary as well: https://dictionary.telemetry.mozilla.org/apps/firefox_ios

Probes to Move

• reader_mode.close
• reader_mode.open

Note: The ReaderMode tag will be automatically applied at the top of your new reader_mode.yaml file created with the FirefoxTelemetryUtility.sh script.

Example

You can see an example of this type of work in the following PR: https://github.com/mozilla-mobile/firefox-ios/pull/27083

:information_source: Reference Person

@ih-codes

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