Global notification toggles or repository watch rules for low-noise mention alerts

Goal is to receive mention and push alerts while suppressing low-priority events such as new user joins or repository creation without creating notification noise.

Global notification preferences allow disabling email for event types across all repositories. This reduces noise universally but can cause missed alerts where the event type is relevant in a specific context. Repository-level watch modes such as Watching and Watching with releases, plus per-repository Ignore rules, provide finer control per repository, trading broader simplicity for more configuration.

Default noise-filtering behavior is not officially documented and may differ between releases, creating uncertainty about consistent delivery of mention and push alerts across instances.

Which approach preserves mention and push alerts reliably without per-repository maintenance? What is the interaction between Ignore rules and global toggles for mention events? Is the default noise-filtering behavior documented per release?