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doc: Enhance troubleshooting guide with the scale-to-zero issue #1469

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May 21, 2022
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doc: Enhance troubleshooting guide with the scale-to-zero issue #1469

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14 changes: 13 additions & 1 deletion TROUBLESHOOTING.md
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Original file line number Diff line number Diff line change
Expand Up @@ -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

Expand Down Expand Up @@ -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).