The correct option is Choose the notification categories you want and unsubscribe from individual conversations or repositories you no longer wish to follow.

This option aligns with how GitHub notifications are designed to be customized. You can select specific categories such as issues, pull requests, discussions, releases, and security alerts, and you can fine tune delivery preferences so you only receive messages that matter. You can also unsubscribe from a single thread or stop watching a repository when it becomes noisy. This approach gives engineers precise control so they continue to get updates for the work they care about while unrelated activity is filtered out.

Click the "Watch" button on a repository to follow everything that happens there is too broad for minimizing noise because it subscribes you to all activity in that repository which will include many events unrelated to your interests.

Enable automatic watching for all public repositories you can access would dramatically increase noise since it auto subscribes you to a large number of repositories and does not target the specific issues or pull requests you want to follow.

Google Cloud Pub/Sub is not a GitHub notification control and it cannot manage your watch or unsubscribe settings for GitHub issues and pull requests.

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