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doc: enhance troubleshooting guide with the scale-to-zero issue (#1469) 

Ref https://github.com/actions-runner-controller/actions-runner-controller/issues/1057#issuecomment-1133439061
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Yusuke Kuoka 2022-05-22 03:00:40 +09:00 committed by GitHub
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TROUBLESHOOTING.md
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@ -9,7 +9,7 @@
* [Delay in jobs being allocated to runners](#delay-in-jobs-being-allocated-to-runners)
* [Runner coming up before network available](#runner-coming-up-before-network-available)
* [Outgoing network action hangs indefinitely](#outgoing-network-action-hangs-indefinitely)
* [Unable to scale to zero with TotalNumberOfQueuedAndInProgressWorkflowRuns](#unable-to-scale-to-zero-with-totalnumberofqueuedandinprogressworkflowruns)
## Tools
@ -208,3 +208,15 @@ spec:
There may be more places you need to tweak for MTU.
Please consult issues like #651 for more information.
## Unable to scale to zero with TotalNumberOfQueuedAndInProgressWorkflowRuns
**Problem**
HRA doesn't scale the RunnerDeployment to zero, even though you did configure HRA correctly, to have a pull-based scaling metric `TotalNumberOfQueuedAndInProgressWorkflowRuns`, and set `minReplicas: 0`.
**Solution**
You very likely have some dangling workflow jobs stuck in `queued` or `in_progress` as seen in [#1057](https://github.com/actions-runner-controller/actions-runner-controller/issues/1057#issuecomment-1133439061).
Manually call [the "list workflow runs" API](https://docs.github.com/en/rest/actions/workflow-runs#list-workflow-runs-for-a-repository), and [remove the dangling workflow job(s)](https://docs.github.com/en/rest/actions/workflow-runs#delete-a-workflow-run).