docs: two runbooks and a release trap, all from real incidents - #13
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Everything here was hit during the 2.1.x rollout and the production cutover. **403 on session launch after a deploy.** A restarted operator recreates the eager-start warm-pool instances and their oauth2-proxy ConfigMaps, rebuilding `authenticated-emails-list` empty. Sessions already assigned to one keep pointing at it, and oauth2-proxy denies everybody when the list is empty. Login succeeds, the session 403s, and nothing is logged. The runbook gives the check that identifies it and the one-command fix. **Certificate stuck with no challenges outstanding.** Distinguishes a transient ACME finalize failure - which cert-manager retries only after an hour of backoff, and which is cleared by patching the status - from a name whose listener or DNS is genuinely wrong. Both look the same from outside. **The release tag trap.** The shared build workflow strips a leading `v`, but an `image-tag` override is used verbatim, so a caller passing the raw tag publishes `v1.2.0`. The spelling that passes the tag-format check is the one that breaks the images, which is what kept it hidden. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019qeiQRFu8xAMRYWPdZewjG
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe documentation adds release image-tag guidance and two incident-response runbooks. The runbooks cover session-launch 403 errors after deploys and certificates stuck in ChangesRelease image-tag guidance
Incident-response runbooks
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This PR adds incident runbooks and release-policy documentation without changing product or deployment behavior; no actionable merge-blocking risk remains after normal checks and review. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@docs/admins/operations/incident-response.md`:
- Around line 381-384: Add the text or console language tag to the fenced error
block containing “Failed to finalize Order,” leaving its error content
unchanged.
- Line 395: Update the incident-response guidance around “Challenges pending and
staying pending” to distinguish DNS resolution or Gateway connectivity failures
from HTTP routing failures: describe DNS, connection, and timeout errors for
unreachable hosts, and reserve HTTP 404 for cases where an endpoint responds but
does not route the HTTP-01 solver path.
- Around line 370-393: Update the certificate finalization troubleshooting
section to require kubectl v1.24 or newer and instruct operators to inspect the
owning CertificateRequest, Order, Challenge, and their events before
remediation. Make clear that the status patch is appropriate only after
confirming the exact 404 “Certificate not found” finalization failure, rather
than relying on Certificate conditions alone, and retain the existing
backoff-clearing fields for cert-manager v1.16.2.
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…estart Verifying the fix on a test environment showed the mechanism I had written down was wrong. `ensureCapacity` only creates ConfigMaps that are missing, so restarting the operator with everything present is a no-op - confirmed empirically against the old build. The wipe comes from `reconcile`, where the instance ConfigMaps are treated as outdated when the AppDefinition's metadata.generation changes, which is what a helm upgrade does. The user-facing symptom is unchanged, and 'it broke after a deploy' still holds. The distinction matters for anyone reading the operator, and for deciding whether a plain restart is a safe thing to try. Also records that the operator fix is merged, and that a broken installation heals within about twenty seconds of the fixed operator starting - verified against a real reproduction rather than a simulated one. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019qeiQRFu8xAMRYWPdZewjG
Three findings, all valid. The runbook went straight to patching away cert-manager's backoff. It now says to confirm the finalize 404 by reading down the chain the Certificate owns - CertificateRequest, Order, Challenge - since the Certificate's own conditions rarely say enough, and to apply the patch only for that confirmed failure. Notes that --subresource needs kubectl v1.24 or newer, and says what to do when the cleared retry fails too, rather than asserting the cause is always transient. Pending challenges are now split by what the Challenge actually reports. An HTTP 404 means something answered but did not route the solver path; a DNS failure, refused connection or timeout means nothing answered at all, and no amount of listener configuration helps until the challenge reaches the cluster. The previous text ran the two together. Also tags the error fence, which markdownlint flagged as MD040. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019qeiQRFu8xAMRYWPdZewjG
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Everything here was hit during the 2.1.x rollout and the production cutover, so each entry is a failure that actually occurred rather than one that might.
Runbook: 403 on session launch after a deploy
A restarted operator recreates the eager-start warm-pool instances and their oauth2-proxy ConfigMaps, rebuilding
authenticated-emails-listempty. Sessions already assigned to one keep pointing at it, and oauth2-proxy denies every authenticated user when that list is empty.The user logs in successfully and then gets 403 indefinitely. Nothing is logged and
status.operatorMessageis empty, so there is no thread to pull without knowing this. The runbook gives the check that identifies it - an empty list on the claimed instance, against a populated one on any session with its own pod - and the one-command fix.eagerStart: trueis the default, so every installation is exposed. Tracked in EduIDE-Cloud#135.Runbook: Certificate stuck, no challenges outstanding
Distinguishes two failures that look identical from outside:
404 acme:error:malformed: Certificate not found) after the challenges have already validated, which cert-manager retries only after an hour of exponential backoff - clearable by patchingfailedIssuanceAttemptsandlastFailureTime;Hit during the
tum-productionbootstrap; the first retry succeeded.Release policy: a caller can defeat the
vstrippingThe shared build workflow derives the image tag with
${RELEASE_TAG#v}, but animage-tagoverride is used verbatim. A repository passinggithub.event.release.tag_nametherefore publishesv1.2.0, which no chart can consume - while a tag spelled1.2.0produces the correct image and merely fails the tag-format check.That is what kept it hidden: the spelling that passes CI is the one that breaks the images. Fixed in EduIDE-Cloud and EduIDE-Landing-Page.
scripts/check-docs.shALL PASS.Summary by CodeRabbit