+- Deploys now stop idle App Engine versions automatically. The staging version is stopped after its integration tests pass, and after a production promote only the two newest production versions stay warm while every other superseded version is stopped. Stopped versions are then pruned to the newest 10 production and newest 3 staging (older prod, older staging, and legacy timestamp-named versions are deleted). This removes always-on Flexible-environment VM cost from versions that serve no traffic, while keeping recent production versions available for rollback via `gcloud app versions start`.
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