[v14] Execute time-bound graceful shutdowns on `SIGINT`/`SIGTERM`.#32189

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Sep 21, 2023

Commits on Sep 20, 2023

Execute time-bound graceful shutdowns on SIGINT/SIGTERM.

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Run `process.Shutdown()` in separate goroutine, to account for possible bugs.

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Support TELEPORT_UNSTABLE_SHUTDOWN_TIMEOUT env var.

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Extract `getShutdownTimeout`, add tests.

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Update lib/service/signals.go

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Remove untrappable SIGKILL to reduce confusion.

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