We currently have telemetry for the performance of reader view, but we don't have any telemetry that lets us know how often users actually use this feature. I think we should add a UI telemetry probe for this here: http://mxr.mozilla.org/mozilla-central/source/mobile/android/chrome/content/Reader.js#149

We do start/stop a "reader.1" session: http://mxr.mozilla.org/mozilla-central/source/mobile/android/chrome/content/Reader.js#185 Yes, a session is different than an "action" so I wouldn't block adding a new action.

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