fix(ingress): pin default-backend image to busybox:1.38.0#111
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The ingress default backend (the static "nodes not ready" waiting page) used busybox:latest, making image selection non-reproducible -- a chart upgrade or pod reschedule could silently pull a different busybox build. Pin it to a specific release tag, consistent with how the chart pins its other images. Co-Authored-By: Claude Opus 4.8 (1M context) <[EMAIL_ADDRESS_REDACTED]>
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Summary
The ingress default backend (the static "nodes not ready" waiting page) ran
busybox:latest. An unpinned tag makes image selection non-reproducible — a chart upgrade or pod reschedule could silently pull a different busybox build. This pins it to a specific release tag, consistent with how the chart pins its other images.Details
templates/workload/fallback.yaml:busybox:latest→busybox:1.38.0(latest stable busybox release; verified as an active tag on Docker Hub).Kept intentionally minimal: the default backend is a cosmetic, nginx-ingress-only static page, and
ingress.config.defaultBackend.enabled=falsealready provides a clean opt-out for environments wheredocker.iois unreachable — so no new values/schema surface was added.Linked issues
No linked issue — addresses the "pin fallback image tag" recommendation from the 2025-12 third-party chart evaluation.
PR Checklist
Please check the items that apply to your change.
Testing Checklist
Static Validation
helm lint ./charts/grayloghelm template graylog ./charts/graylog --validateInstallation
helm install graylog ./charts/graylogSpecific to this PR
ingress.enabled=true+ingress.config.defaultBackend.enabled=truebusybox:1.38.0(digestsha256:fd8d9aa6…), 0 restarts/healthz,/livez,/readyz→okE404handler for unmatched routes (default-backend behavior unchanged)Notes for reviewers
🤖 Generated with Claude Code