Zoekt observability: the ORR runbook pages and the alerts index

🤖 AI-authored change.

Adds a runbook page for each of the 8 Zoekt alerts added in merge request 2 of this stack, plus an index at docs/zoekt/README.md. The runbook: annotation on every one of those rules points here, so scripts/validate-alerts resolves each link once this lands.

  • Each page states what the alert measures, what it does not, the first queries to run, and where to route when the signal is not actionable from Zoekt itself.
  • Three panels referenced by the storage and node pages are empty on gprd and gstg today because both environments pin gitlab-exporter 16.8.0 and the metrics arrived in 16.9.0. The affected page says so and routes the on-caller elsewhere.
  • Prose only. No rule, dashboard or test changes.

Reviewer focus: whether the triage steps are the ones an on-caller who has never touched Zoekt would actually follow.

Review order

Merge request 3 of 3 splitting !11489 (closed), which was declined as too large to review.

Order Merge request Target Contents
1 Zoekt observability: dashboard master Dashboard and its two reducer guards
2 Zoekt observability: alert rules jmason/zoekt-obs-1-dashboard 8 alerts, jsonnet + generated YAML + promtool tests
3 this one jmason/zoekt-obs-2-alerts 9 docs/zoekt/ pages, prose only

🤖 Automated change. Mention @johnmason to leave feedback.

🤖 Verification notes (for agents / deep readers)
  • markdownlint-cli2 --config .markdownlint.yml over the 9 changed pages — 0 issues in 0 files.
  • scripts/validate-alerts exits 0, with every runbook: annotation from merge request 2 resolving to a page added here.
  • The split is lossless: every one of the original merge request's 20 file blobs is byte-identical at the top of this stack, and git diff over those paths between the original branch and this one is empty.

What I did not verify

  • The pages have not been walked through against a real incident; the triage steps are derived from the metric definitions and the Rails code, not from a post-incident review.

Merge request reports

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