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Make the Outdated phase revision-aware

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An outdated runner used to flip the whole scale set into the Outdated
phase permanently, which tears down the listener and switches the scale
set off. That verdict outlived the runner spec it was about: a runner
busy with a job survives the revision cleanup that follows a spec
update, and only reports Outdated once the job finishes. The result was
that a freshly applied fix could be discarded by a runner that never ran
it.

Runners are now stamped with the actionable revision they were built
from. An Outdated runner whose revision is behind the applied revision is
considered stale: it is deleted so the scaling logic replaces it with one
built from the current spec, and it no longer contributes to the set's
phase. A runner at the current revision still marks the set Outdated, so
a genuinely bad spec is still surfaced.

Two supporting fixes:

  - patchAppliedActionableRevisionStatus now recomputes the phase in both
    directions. It only ever forced Running, so the early-return path
    could leave a stale Outdated behind.

  - The AutoscalingRunnerSet only tears down on an Outdated set once that
    set has applied its current actionable revision. Otherwise a spec
    update races the EphemeralRunnerSet controller and the teardown fires
    against a phase that predates the update.

Runners created before this change parse to revision 0, which matches
the zero value of AppliedActionableRevision, so they are treated as
current until a revision is actually applied.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Nikola Jokic
2026-09-08 17:27:39 +02:00
co-authored by Copilot App
parent 2aef0aeedd
commit 41d05325c2
7 changed files with 439 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
controllers/actions.github.com/constants.go
+6
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@@ -50,6 +50,12 @@ const (
AnnotationKeyGitHubRunnerGroupName = "actions.github.com/runner-group-name"
AnnotationKeyGitHubRunnerScaleSetName = "actions.github.com/runner-scale-set-name"
AnnotationKeyPatchID = "actions.github.com/patch-id"
// AnnotationKeyActionableRevision records the EphemeralRunnerSet
// Spec.ActionableRevision that was in effect when the runner was created. It
// lets the set tell apart a runner that reported Outdated against the current
// runner spec from one that reported it against a spec that has since been
// updated.
AnnotationKeyActionableRevision = "actions.github.com/actionable-revision"
)
// Labels applied to listener roles