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LokiVLProxyBackendUnreachable

  • Signal: sustained 502 responses from proxy to clients.
  • Likely causes: VictoriaLogs outage, network/DNS path break, backend auth mismatch.

Triage​

  1. kubectl -n <ns> exec <proxy-pod> -- wget -qO- http://<victorialogs>:9428/health
  2. Validate -backend URL, DNS resolution, and network policy.
  3. Validate backend auth headers/credentials used by proxy.
  4. Check backend saturation and error logs.

Mitigation​

  • Restore backend service/network reachability.
  • Fix backend auth credentials or forwarded headers.
  • Fail over to healthy backend if your topology supports it.

Recovery Criteria​

  • 502 rate returns to baseline.
  • Proxy readiness remains stable.
  • Circuit breaker closes and stays closed.

Prevention​

Apply Deployment And Scaling Best Practices for backend health probes, network path hardening, and failover readiness.