Debugger is officially deprecated; however, it will be available for at least the period of time defined in the terms of service. Cloud Debugger is scheduled to be shutdown on May 31, 2023.
Snapshot Debugger is an open source debugger that lets you inspect the state of a running cloud application, at any code location, without stopping or slowing it down. It isn't your traditional process debugger but rather an always on, whole app debugger taking snapshots from any instance of the app.
You can use the Snapshot Debugger with any deployment of your application, including test, development, and production. The debugger adds less than 10ms to the request latency only when the application state is captured. In most cases, this latency isn't noticeable by users.