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You manage a Compute Engine managed instance group at AppScale Corp. , which automatically scales instances up and down based on application load. Each instance runs a shutdown script that is supposed to clean up REDIS database entries associated with that instance. However, you've noticed that many REDIS entries remain after instance shutdowns, and you suspect the shutdown script is not executing reliably . To fix this, you've created a Cloud Function that can remove the REDIS entries. What should you do next to ensure reliable cleanup every time an instance is shut down ?