The agent refuses work that reaches it while it is shutting down, instead of accepting it…

v0.42.0-beta

The agent refuses work that reaches it while it is shutting down, instead of accepting it and failing it. Between the stop signal and the actual shutdown it kept presenting itself as available: deployments received in that window started on an already-cancelled context and failed in a millisecond, with an error message that explained nothing. Six client deployments were lost this way in a single day. They are now refused with an explicit reason, which allows them to be replayed once the agent is back, and work already under way is still waited for as before.