Live migration makes Google Compute Engine unusually forgiving. Most host maintenance happens without restarting your instance, which is excellent engineering and a quiet problem for reliability practice. Teams running on GCP accumulate less operational experience with instance loss than teams elsewhere, so when an instance does disappear, nobody has walked the recovery path.

The failure modes still exist. Instances terminate, zones have bad days, and Spot VMs get reclaimed by design. What's missing is the muscle memory, and that only comes from running the failure deliberately rather than waiting for it.

Gremlin gives you that practice safely. Install the Gremlin Agent on your instances and run Shutdown experiments to confirm your managed instance group replaces what it loses. CPU, memory, and disk experiments show you where autoscaling engages relative to the load that degrades your service. Blackhole experiments isolate a zone so you can prove your regional deployment tolerates losing one.

A platform that rarely fails produces teams who have never practiced failure. Testing on purpose is how you build that experience before Google's engineering stops covering for you.