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docs: record K3s imagefs DiskPressure diagnosis

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Ivan Malison
2026-07-12 13:20:17 -07:00
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dotfiles/agents/skills/disk-space-cleanup/SKILL.md
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@@ -125,6 +125,8 @@ Read `references/cleanup-patterns.md` before touching private service state, run
Prefer service-aware sequences: stop the service, clean only validated cache/work paths, recreate required directories with correct ownership, restart, and verify health.
- 2026-07-10 `railbird-sf` incident: K3s reported `DiskPressure` even with tens of GiB free because its container `imagefs` shares `/`, kubelet image GC used the default 85% high-water mark, and the K3s config overrode only `nodefs` eviction thresholds. `crictl imagefsinfo` showed only ~677M of images, so image GC could not reclaim its requested ~149G and repeatedly evicted application pods. Set matching `imagefs.available` values alongside `nodefs.available` in `eviction-hard`, `eviction-soft`, and `eviction-soft-grace-period`; verify via K3s eviction-manager logs rather than trusting `df` alone.
## Safety Rules
- Do not delete user documents, source code, credentials, volumes, or unknown data without explicit approval.