Backport of Bugfix: auto-promote canary taskgroups when mixed with non-canary taskgroups into release/1.1.x #12605
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Backport
This PR is auto-generated from #11878 to be assessed for backporting due to the inclusion of the label backport/1.1.x.
The below text is copied from the body of the original PR.
When using the auto promote feature with canary deployments that have task groups without canaries, the deployment will never auto promote and hang even when the canaries are all healthy for the task groups that it has been enabled for.
This PR fixes this bug by skipping task groups that have no canaries set during the auto promote validation and adds a test to catch this case specifically. To see what occurs when this fix is not implemented (as has been observed in mainstream Nomad):
L292-L294 of nomad/deploymentwatcher/deployment_watcher.goLet me know if there's anything I can do to help shepard this through into a release, currently there's manual intervention in some of our deployments that this occurs in and it would be great to alleviate that.