maintain-platform

name

maintain-platform

description

Repo + live-platform health/maintenance menu for devantler-tech/platform (GitOps — Kustomize overlays + Flux CD, Cilium/Talos/KSail/SOPS). Repo side — triage, manifest/Helm/Flux investigation & fixes, Helm chart + Actions version bumps, manifest cleanup, stale-PR nudges (static validation; never spin up a cluster to test a diff). Live side — read-only health investigation of the running prod cluster + its observability stack (Flux Kustomizations/HelmReleases, Coroot, Kubescape, Kyverno + Policy Reporter, Kubernetes events) — including driving Kyverno policy violations to zero. Use when the daily maintainer selects Platform.

Maintain: Platform

Platform has two surfaces to keep healthy and advance — the repository (manifests, Helm, Flux, policies) and the live platform (the running prod cluster it delivers). Cover both each time you select Platform: the repo can be green while the cluster is unhealthy (and vice-versa).

Repository menu (canonical, maintained in the product itself)

The canonical repo maintenance task menu lives in the repo — read the ## Maintenance section of platform/AGENTS.md (on the submodule's latest main): https://github.com/devantler-tech/platform/blob/main/AGENTS.md. For validating a repo/PR change, use static validation (kustomize build + schema/kubeconform, per that menu) — never spin up a cluster just to test a manifest diff. Shared cross-repo rules are in the monorepo AGENTS.md. This part of the card is a pointer by design — the repo menu is maintained once, in the product's own AGENTS.md.

Status & live-platform health investigation (read-only)

Investigating how the platform itself is doing is a first-class part of every Platform run — do it read-only against the running prod cluster + its observability stack, and dedupe against the accepted "known non-issues" baseline in your native memory so you don't re-chase by-design/transient signals. Pin the context — kubectl --context=admin@prod … (the shared kubeconfig drifts across parallel sessions, and its API endpoint can go stale after a control-plane recreate; the refresh recipe

• healthy baseline counts live in native memory). Query at least the following; the list is non-exhaustive — chase any other anomaly you see:

• Flux Kustomizations — kubectl --context=admin@prod get kustomization -A (Ready? suspended? drifting/last-applied revision? health-check timeouts?). For a stuck/failing reconciliation, the gitops-cluster-debug skill (Flux MCP server) traces the dependency chain on the live cluster.
• Flux HelmReleases — kubectl --context=admin@prod get helmrelease -A (Ready? install/upgrade retries exhausted? stuck/pending-upgrade?).
• Coroot — Incidents, Alerts/SLO burn, Traces, Logs, Risks (deployment & health-check risks), and cost optimizations (Node/cost view). Use its read API — the access recipe (project id, auth, the SPA-200-masks-404 gotcha, the empty-Hetzner-cost-rollup known limitation) is in native memory.
• Kubescape — the three finding surfaces (posture / CVE / runtime), for security-posture regressions vs the last run. A 0/empty reading is NOT automatically "clean" — verify the scanner is actually producing data first (a broken scanner reads identically to a compliant cluster). See the dedicated Security posture section below for the object names, the broken-vs-clean checks, and the fix-vs-except ladder.
• Kyverno + Policy Reporter — policy validation & enforcement: kubectl --context=admin@prod get cpol,pol -A (policies present? mode Audit vs Enforce?) and polr,cpolr -A (PolicyReport / ClusterPolicyReport — failing rules and violating resources). Policy Reporter aggregates every report into a dashboard + read API (SSO UI at policy-reporter.${domain}; in-cluster API policy-reporter.policy-reporter.svc:8080) for a whole-cluster view of failing results. Driving those failures to zero and holding it is a standing objective — see the dedicated Policy compliance section below.
• Kubernetes events & warnings — kubectl --context=admin@prod get events -A --field-selector type=Warning, plus unhealthy / CrashLooping / Pending pods and abnormal restart counts.
• Other problems — node/Talos & etcd-quorum health, Longhorn volume health, cert-manager certs, external-secrets/OpenBao sync, ingress/Envoy reachability — and anything else off the healthy baseline.

Guardrails. Investigation is read-only — never mutate prod to "test", and never spin up a new cluster for it (live-cluster reliability E2E is the ~weekly heavy task, and you never spin up real clusters more than once a day portfolio-wide — contract Cadence). Operational recovery follows platform/AGENTS.md + the DR runbook. Turn a confirmed, off-baseline problem into the right artifact — a root-cause draft PR to the platform repo (manifest/Helm/policy fix) or a triaged issue — never a hand-edit of generated files and never a guardrail bypass.

Security posture (Kubescape) — drive to 100% and hold

Kubescape runs three finding surfaces; driving all three to 100% and holding them is a standing objective, not a floor (epic + children: devantler-tech/platform#2447). On the live-health cadence the Survey step delegates this read to the read-only platform-security-surveyor agent (compact delta digest, liveness-first); the object names and checks below are the shared reference for that agent and for any interactive investigation. The recurring trap, learned the hard way (2026-07-04, all three surfaces were silently dead): an empty/zero reading almost always means the scanner is broken, not that the cluster is clean — a broken scanner and a compliant cluster look identical, so check liveness first, every time:

• Posture (config scan) — configurationscansummaries / workloadconfigurationscansummaries (per-namespace scores + failed controls). Broken if scores are 0.00 across frameworks, controls: null en masse, or objects are days stale — check the kubescape scanner pod logs for scan aborts. Note: the CI gate (ksail workload scan --framework nsa --compliance-threshold N) is a separate static scan in a healthy CLI context — a green CI gate does NOT prove the in-cluster scan works.
• CVE (kubevuln) — vulnerabilitymanifestsummaries / vulnerabilitymanifests. Broken if manifests carry no grype matches / no tool.name and summaries are empty (both .all and .relevant) — check kubevuln logs for ScanCP … partial (the relevancy path aborting on partial ApplicationProfiles). Prioritise by relevancy × severity × fixability; emit VEX to suppress non-reachable CVEs.
• Runtime (node-agent) — applicationprofiles, networkneighborhoods, and the node_agent_alert_counter metric. Invisible if the exporters are stdout-only (alertManagerExporterUrls: [], prometheusExporterEnabled: false). Route natively to Coroot (minimal-custom, all declarative): node-agent Prometheus exporter → coroot.com/scrape-metrics annotation → a custom PromQL alertingRules[] in the Coroot CR → the existing Slack notificationIntegrations webhook — no new infra (Coroot CE supports custom-PromQL alerts natively; it has no standard Alertmanager, so don't add one).

Fix-vs-except ladder — the definition of done for a finding. An exception is the audited last resort, never the first move:

1. Fix the manifest/root cause — the real remediation (securityContext, RBAC scope, probes, labels).
2. Runtime-enforce — if it's mutated/enforced at admission (Kyverno) or by the network layer (Cilium), it's covered even where the static scan can't see it; graduate a fixed control into Kyverno Enforce so it can't regress.
3. Except only when genuinely irreducible (e.g. C-0002, the KubeVirt operator's pods/exec RBAC) — a narrow, justified ClusterSecurityException in k8s/bases/infrastructure/cluster-security-exceptions/ with a written why, reviewed via PR, and periodically pruned. A growing exceptions dir is a smell, not progress.

A confirmed off-baseline finding on any surface — including a scanner that has silently stopped producing data — becomes a security issue under the epic (capture step), or a hotfix if it's active breakage. Ratchet the CI --compliance-threshold up as gaps close; never lower it.

Policy compliance (Kyverno) — drive violations to zero and hold

Kyverno admission policies emit PolicyReport / ClusterPolicyReport results for every workload; driving the failing results to zero and holding them there — so everything in the cluster runs compliant — is a standing objective, not a floor. This is the admission-time twin of the Kubescape Security posture program above (policy vs posture scan); apply the same discipline.

• Enumerate every run via Policy Reporter — the dashboard/read API that aggregates all reports (SSO UI at policy-reporter.${domain}; in-cluster API policy-reporter.policy-reporter.svc:8080) — or kubectl --context=admin@prod get polr,cpolr -A. The fail count is the zero-and-hold target — treat a newly introduced fail as a regression to clear promptly, like a red CI check, not just the long-standing backlog. Track warn results in a separate tally: they are a softer lead signal (a policy still in Audit that will graduate to Enforce, or a deprecation notice), so triage and work them down — fix the ones that mask a real issue — but they do not share fail's hard zero-gate, and lumping them into one number just muddies the remediation queue.
• Fix-vs-except ladder — same as Kubescape (an exception is the audited last resort, never first):
  1. Fix the manifest/root cause — correct the offending workload at its source so it satisfies the rule (add the missing securityContext / limits / label / PDB / probe / image pin), shipped as a draft PR. Never silence a real violation.
  2. Runtime-enforce & graduate — once a rule's findings are at zero, graduate its policy from Audit to Enforce so the violation is blocked at admission and cannot regress (a weak Audit-only policy that could Enforce is itself a roadmap lever).
  3. Except only when genuinely by-design — add a scoped, reasoned exclude to the relevant Kyverno ClusterPolicy in k8s/bases/infrastructure/cluster-policies/, with a written why, reviewed via PR. The repo exempts via per-policy exclude blocks — PolicyException CRs are not enabled. An exclude that hides a fixable violation is a suppression, not an exception; a growing exclude list is a smell, not progress.

Record the residual (genuinely-excepted) baseline in native memory so a later run doesn't re-chase a documented by-design exemption — mirroring the Kubescape known-non-issues baseline. A confirmed violation becomes a security/bug draft PR (fix) or a triaged issue (larger cleanup); active admission breakage (an Enforce policy rejecting a legitimate workload) is a hotfix.

Roadmap & enhancement

Platform's roadmap lives in GitHub Issues on devantler-tech/platform (roadmap epics + milestones). Advance via product-engineering — on the repo side: manifest/Helm/Flux structure & quality, policy & security posture, Kustomize hygiene (static validation, not unit tests). On the live side: the health investigation above is also an enhancement engine — gaps it surfaces (a missing alert/SLO, a weak/Audit-only policy that should Enforce, an unaddressed Coroot risk or cost optimization, a reliability hotspot) become roadmap/ enhancement issues or focused draft PRs.