USHIFT-7500: Recover metrics-server TLS after restart storms - #7392
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Requeue service-ca while the optional metrics-server serving Secret is missing or incomplete after a restart storm. Add focused unit and Robot regression coverage.
Wait for service-ca readiness, clear its retry-ceiling annotations in one conflict-safe Service update, and wait read-only for the serving Secret. Add deterministic recovery coverage without issuing serving certificates outside service-ca.
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@redhat-chai-bot: This pull request references USHIFT-7500 which is a valid jira issue. Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "5.1.0" version, but no target version was set. DetailsIn response to this:
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. WalkthroughMetrics-server certificate provisioning now detects invalid serving certificates, waits for service-ca readiness, triggers reconciliation, and polls for replacement TLS data. Unit tests and an optional restart-storm suite validate recovery and retry behavior. ChangesMetrics-server certificate recovery
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ProvisionMetricsServerCerts
participant KubernetesAPI
participant ServiceCA
ProvisionMetricsServerCerts->>KubernetesAPI: Check metrics-server TLS Secret
ProvisionMetricsServerCerts->>KubernetesAPI: Check service-ca Deployment and metrics Service
ProvisionMetricsServerCerts->>KubernetesAPI: Update metrics Service annotations
ServiceCA->>KubernetesAPI: Recreate metrics-server TLS Secret
ProvisionMetricsServerCerts->>KubernetesAPI: Poll for valid certificate and key
Merge Risk: 🟡 Moderate · up to A transient Kubernetes API failure can stop certificate recovery during startup, leaving metrics availability at risk until a later restart. Resolve the retry gap before merging. 🚥 Pre-merge checks | ✅ 14 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (14 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 7.69% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 26 functions across 2 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
Warning Some tools did not complete. Review the errors below. 🔧 golangci-lint (2.13.2)level=warning msg="The linter 'gomodguard' is deprecated (since v2.12.0) due to: new major version. Replaced by gomodguard_v2." ... [truncated 30939 characters] ... : is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/pod-security-admission: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/sample-apiserver: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/sample-cli-plugin: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/sample-controller: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/cri-streaming: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\tk8s.io/streaming: is replaced in go.mod, but not marked as replaced in vendor/modules.txt\n\n\tTo ignore the vendor directory, use -mod=readonly or -mod=mod.\n\tTo sync the vendor directory, run:\n\t\tgo mod vendor\n" Comment |
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Inline comments:
In `@pkg/components/metrics.go`:
- Around line 105-150: Update waitForServiceCAController,
waitForMetricsServerService, and triggerMetricsServerServingCertReconciliation
to retry transient Kubernetes API connection/server errors within the existing
context and backoff/deadline, while returning terminal errors such as
authorization failures immediately. Preserve NotFound polling behavior and
conflict retries, and ensure both reconciliation reads and updates participate
in the transient retry path.
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pkg/components/metrics.gopkg/components/metrics_test.gotest/suites/optional/metrics.robot
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3 participants
Summary
Recover the service-CA-managed metrics-server serving certificate after MicroShift restart storms so the metrics API and namespace finalization can recover.
Changes
Validation
./pkg/componentsgolangci-lintmake verify-shmake verify-configmake verify-crdsmake verify-rfmake verify-vendor-etcdmake microshiftmake verify-imagesgit diff --check upstream/main...HEADThe final worktree is clean.
AI-generated. Review for accuracy.
@pmtk requested via Chai Bot
Summary by CodeRabbit
Bug Fixes
Tests