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fix(kyverno): scan kube-system, kube-public and kube-node-lease in the background again - #4235
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…e background again Drop the three Kubernetes system namespaces from Kyverno's resource filters so background scans report on them; keep the kyverno namespace filtered because two generate policies do not exclude it. The throwaway-cluster proof now requires a report in each of the three namespaces and none in kyverno. Fixes #4234 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe Helm configuration removes resource filters for Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to The proof can pass even if background scans have stopped reporting on a covered namespace. Require a current result before relying on it for merge readiness. Architecture SummaryArchitecture risk: 🟡 Medium · up to The change affects 4 systems. Changed systems: Architecture concerns Review detailsSystems and components
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Inline comments:
Review comments at @scripts/prove-kyverno-stale-report-prune.sh:
- Line 200: Update the probe setup and probe_reported check so each covered
namespace must have a probe result newer than the fixture application: record a
timestamp before applying the fixtures, then verify each result’s timestamp is
later than that baseline rather than accepting a surviving PolicyReport’s old
policy/rule result.
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docs/policy-reports.mdk8s/bases/infrastructure/controllers/kyverno/helm-release.yamlscripts/prove-kyverno-stale-report-prune.shtests/kyverno-stale-report-prune/unevaluated-namespace-fixtures.yamltests/kyverno-stale-report-prune/values.yaml
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🧠 Learnings (1)
📚 Learning: 2026-08-11T12:41:28.242Z
Learnt from: devantler
Repo: devantler-tech/platform PR: 3082
File: k8s/bases/infrastructure/controllers/coroot/cron-job-cnpg-degraded-alert.yaml:113-120
Timestamp: 2026-08-11T12:41:28.242Z
Learning: When changing behavior in Kubernetes manifests or related documentation, review comments and documentation in YAML/YML and Markdown files for statements describing the previous behavior. Update every stale statement in the same change so the repository’s explanatory text remains consistent with the implementation.
Applied to files:
docs/policy-reports.md
… the filter change The Kyverno HelmRelease is on the authorization surface, so editing its values moves the aggregate. The required job reported exactly one changed entry, HelmRelease kyverno/kyverno, and nothing added or removed. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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… comments A first probe report in kube-public or kube-node-lease can come from admission, so the proof now requires each covered probe result to advance after completed background scans. Comments that still said the three namespaces are filtered now describe the new boundary. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…paces are filtered Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Why
Since June, no Kyverno policy has checked anything in the cluster's core system namespaces, so the compliance dashboard silently leaves out the workloads that run the cluster itself.
What
Kyverno's background scans cover the three Kubernetes system namespaces again, so they get current policy reports without anything new being blocked, created or changed there. Kyverno's own namespace stays out, because two policies would otherwise start adding network and resource rules inside it. The throwaway-cluster proof and the policy-reports guide now check and describe exactly that boundary.
Fixes #4234