Allow repeated MachineConfigNodeFailed events on single-node upgrades - #31550
Allow repeated MachineConfigNodeFailed events on single-node upgrades#31550redhat-chai-bot wants to merge 1 commit into
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository YAML (base), Central YAML (inherited) Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (2)
Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. WalkthroughAdds an upgrade-only matcher for repeated ChangesMachineConfigNodeFailed upgrade matching
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This localized change adjusts repeated-event handling for single-node upgrades and adds focused tests; no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 15✅ Passed checks (15 passed)
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Inline comments:
In
`@pkg/monitortestlibrary/pathologicaleventlibrary/duplicated_event_patterns.go`:
- Line 549: Move registration of
newSingleNodeMachineConfigNodeFailedEventMatcher from
NewUniversalPathologicalEventMatchers to NewUpgradePathologicalEventMatchers so
it applies only during upgrade analysis. Add coverage verifying
NewUniversalPathologicalEventMatchers does not permit this event, while
preserving the matcher in the upgrade matcher set.
In `@pkg/monitortestlibrary/pathologicaleventlibrary/duplicated_events_test.go`:
- Around line 252-297: Add a SingleReplica test case alongside the existing
MachineConfigNodeFailed cases with AnnotationCount set to "40" and
expectedAllowName set to MachineConfigNodeFailedDuringSingleNodeUpgrade,
verifying the threshold is inclusive. Preserve the existing count-41 case and
its expected rejection.
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pkg/monitortestlibrary/pathologicaleventlibrary/duplicated_event_patterns.gopkg/monitortestlibrary/pathologicaleventlibrary/duplicated_events_test.go
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During a single-node (SNO) upgrade the cluster's only node reboots, taking the kube-apiserver down with it. While the API is unreachable the machine-config-operator cannot resync machineconfignodes, so library-go repeatedly surfaces an "OperatorDegraded: MachineConfigNodeFailed" event on the machine-config ClusterOperator in ns/openshift-machine-config-operator (e.g. `dial tcp 172.30.0.1:443: connect: connection refused`). The API server recovers once the reboot completes, so these repeats are expected behavior on SNO rather than a real fault. The pathological-events monitor only has the default threshold (~20) for this event and no SNO-specific override, so the repeats (observed 23-29 times per run across recent 4.21-4.23 SNO upgrade jobs) fail the "events should not repeat" test. Add a SingleReplica topology-gated matcher that raises the allowed threshold to 40 for this event, matching the approach used by the other SNO-specific overrides (ConnectionErrorDuringSingleNodeAPIServerTargetDown, KubeAPIServerProgressingDuringSingleNodeUpgrade). Multi-node topologies keep the default threshold since they retain a control-plane quorum during upgrades, and the override still fails runs where the event repeats past 40 (a sign the API never recovered). Register the matcher only in the upgrade matcher set. The node reboot that triggers these repeats only occurs during an upgrade, so outside an upgrade a burst of MachineConfigNodeFailed events is genuinely pathological and should continue to fail. Unit tests cover the 40-repeat threshold boundary (allowed) and 41 (rejected); because the event text also satisfies the SNO connection-refused matcher and the matcher registry iterates a map in non-deterministic order, the over-threshold test accepts either matcher name for the match assertion. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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/hold while @sadasu looks for a better solution than this or openshift/machine-config-operator#6444 |
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Summary
During single-node (SNO) OpenShift upgrades, the node reboots to apply MachineConfig changes, making the API server temporarily unreachable. The machine-config-operator's MachineConfigNode controller retries API calls during this window, emitting
MachineConfigNodeFailedevents on each attempt. In CI, 23–29 events accumulate during the typical 5–10 minute outage, exceeding the default pathological event threshold of ~20 and causing false test failures.This is expected behavior unique to the
SingleReplicatopology — multi-node clusters have other control-plane nodes available and never see this event pattern.Changes
Adds a new
SingleReplica-gated pathological event matcher forOperatorDegraded: MachineConfigNodeFailedevents inns/openshift-machine-config-operatorwith arepeatThresholdOverrideof 40, following the existing pattern used by other SNO-specific overrides.Details
pkg/monitortestlibrary/pathologicaleventlibrary/duplicated_event_patterns.gonewSingleNodeMachineConfigNodeFailedEventMatcher()AllowedRepeatedEventsalongside existing SNO matcherspkg/monitortestlibrary/pathologicaleventlibrary/duplicated_events_test.goEvidence
OperatorDegraded: MachineConfigNodeFailedrepeating 23–29 times during upgradesJira
Related: OCPBUGS-112466
AI-generated. Review for accuracy.
@neisw requested in Slack thread
Summary by CodeRabbit
New Features
MachineConfigNodeFailedevents during single-node upgrades.Bug Fixes
Tests