Observed Signal · May 20, 2026 · Incident Report · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
ArgoCD drift across three namespaces after JWT hotfix
A week-old manual JWT rotation patched directly into a live Kubernetes cluster created divergent ConfigMap values across three namespaces while ArgoCD auto-sync had been disabled. The discrepancy produced a 30% 401 rate on profile-service because one or more pods used a different JWT algorithm/key than the auth service. The team treated the auth-service live ConfigMap as canonical, exported its JWT fields to Git, committed a single reconciled PR, then synced applications in a guarded order (auth, like, profile) to avoid invalidating tokens. Post-incident controls added an “auto-sync off” watchdog job and a rule requiring hotfixes applied in-cluster to be committed to a merged PR before incident closure.
Operational GitOps incident highlights a common production risk (manual in-cluster hotfix + disabled auto-sync) and documents a safe live-to-Git reconciliation and lightweight monitoring controls; relevant operational guidance for teams running GitOps but not industry-shifting.
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Key Takeaways & Evidence Grounding
- An SRE patched auth-service ConfigMap directly in-cluster with an RS256 JWT public key during a rotation; the change was not committed to Git.
- ArgoCD auto-sync had been disabled across three applications and remained off, allowing the cluster to diverge from Git for about a week.
- Four variants of the same auth-config ConfigMap existed (one in Git, three in three namespaces) with differing JWT_ALGORITHM and JWT_PUBLIC_KEY_ID values.
- Recovery approach: export canonical live auth-service values, commit them to the deploy repo in one PR, then argocd sync apps in order (auth-service, like-service, profile-service) to restore consistency without breaking auth.
- Platform changes: a scheduled job alerts when ArgoCD auto-sync is disabled >4 hours and an incident policy requires merging a PR for any manual kubectl hotfix before closing the incident.
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