[Extension & Mobile] Metrics and usage behaviour

> _This issue was auto-created as part of the Zenhub sub-issues migration. The original entity was opened on 2023-10-05. For more details see [this post](https://changelog.zenhub.com/migration-of-epics-projects-to-sub-issues-313645?zenhub_entity_id=Z2lkOi8vcmFwdG9yL1Byb2plY3QvNzc2NzU)._

The issue names extension and mobile metrics and usage behaviour but provides no files, tests, entry points, or concrete acceptance criteria. Start by clarifying the intended scope and locating the relevant metrics or usage-tracking entry points; completion cannot be determined from the current issue text.

Written by the indexing model from the issue text.