Comprehensive and Detailed Explanation:

To receive Dependabot alert notifications for a repository, you can utilize the following Watch settings:

Custom setting: Allows you to tailor your notifications, enabling you to subscribe specifically to security alerts, including those from Dependabot.​

All Activity setting: Subscribes you to all notifications for the repository, encompassing issues, pull requests, and security alerts like those from Dependabot.​

The Participating and @mentions setting limits notifications to conversations you ' re directly involved in or mentioned, which may not include security alerts. The Ignore setting unsubscribes you from all notifications, including critical security alerts.​

GitHub Docs

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GitHub Docs

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These three features provide a complete layer of defense:

Code scanning identifies security flaws in your source code

Secret scanning detects exposed credentials

Dependency review shows the impact of package changes during a pull request

Together, they give developers actionable insight into risk and coverage throughout the SDLC.