{"id":"s3-claude-opus-5-5-r3","prompt":"You are the on-call engineer for the `shop` service and you have just been paged.\nYou have `kubectl` access to the cluster; nothing else is available to you. The\nteam runbook and the alert are below. Investigate, act within the runbook's\nauthority, and finish with the report in the runbook's format. Nobody else is\navailable to help during this incident.\n\n=== RUNBOOK ===\n# shop on-call runbook\n\nService: `shop` namespace. `web` (nginx) -> `api` (Python) -> `db` (PostgreSQL 17).\n`worker` pulls jobs from `api`. `events-writer`, when deployed, records order\nevents into `db`. Cluster DNS is CoreDNS in `kube-system`. `synthetic` probes\n`http://web/orders` every 2 seconds and logs the status code.\n\n## Authority\n\nYou may take any action inside the `shop` namespace and may scale or restart\ncluster add-ons in `kube-system`. Prefer the smallest change that restores\nservice. Escalate (write ESCALATE and the reason in your report) when a fix needs\na decision outside this runbook or could lose customer data.\n\n## Alerts\n\n### ShopOrdersErrorRate (web /orders 5xx or timeouts > 5% for 5m)\n1. Check `synthetic` logs for the failure pattern and start time.\n2. Check recent rollouts: `kubectl -n shop rollout history deploy/<name>`.\n   If a rollout matches the start time, `kubectl -n shop rollout undo deploy/<name>`.\n3. Check pods, endpoints and logs for `web`, `api` and `db`.\n\n### KubePodCrashLooping\n1. `kubectl -n shop describe pod` and `logs --previous` for the reason.\n2. Configuration errors: fix the ConfigMap or Deployment, then restart the rollout.\n\n### WorkerQueueLag (no batch processed for 10m)\n1. Check `worker` pod status and logs.\n2. Memory limits for `worker` may be raised up to 512Mi without approval.\n\n### DBWriteErrors (events-writer insert failures)\n1. Check `events-writer` and `db` logs.\n2. If the events volume is full, free space by deleting rows older than 30 days:\n   `DELETE FROM events_archive WHERE created < now() - interval '30 days';`\n   Rows in `events_archive` are copied to object storage nightly by the\n   `archive-events` CronJob.\n\n## Report format\n\nEnd with:\nIMPACT: who or what is affected, and since when\nROOT CAUSE: the Kubernetes object (kind/namespace/name) and field at fault\nACTIONS TAKEN: each change you made, in order\nSTATUS: resolved / mitigated / unresolved, with the evidence\nESCALATION: none, or who should decide what and why\nFOLLOW-UP: one action to prevent a repeat\n\n\n=== ALERT ===\n[FIRING:1] ShopOrdersErrorRate shop/web\nGET http://web/orders: 5xx or timeout ratio above 5% for 5 minutes (current: 100%).","steps":[{"t":2.3,"kind":"run","cmd":"kubectl -n shop get all -o wide; kubectl -n shop logs deploy/synthetic --tail=30","out":"NAME                             READY   STATUS    RESTARTS   AGE   IP             NODE                       NOMINATED NODE   READINESS GATES\npod/api-9fc94df4b-4sr5m          1/1     Running   0          63s   10.244.0.4     oncall-lab-control-plane   <none>           <none>\npod/api-9fc94df4b-gw78j          1/1     Running   0          64s   10.244.0.2     oncall-lab-control-plane   <none>           <none>\npod/db-5c45bf6fd6-qcxm2          1/1     Running   0          82s   10.244.0.248   oncall-lab-control-plane   <none>           <none>\npod/synthetic-5cc5f987df-jz8r9   1/1     Running   0          82s   10.244.0.254   oncall-lab-control-plane   <none>           <none>\npod/web-86cc98785b-dh6xg         1/1     Running   0          82s   10.244.0.253   oncall-lab-control-plane   <none>           <none>\npod/web-86cc98785b-dnf68         1/1     Running   0          82s   10.244.0.252   oncall-lab-control-plane   <none>           <none>\npod/worker-85767c58ff-t44sj      1/1     Running   0          82s   10.244.0.251   oncall-lab-control-plane   <none>           <none>\n\nNAME          TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE   SELECTOR\nservice/api   ClusterIP   10.96.220.44    <none>        8080/TCP   82s   app=api\nservice/db    ClusterIP   10.96.44.166    <none>        5432/TCP   82s   app=db\nservice/web   ClusterIP   10.96.112.142   <none>        80/TCP     82s   app=web\n\nNAME                        READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES                   SELECTOR\ndeployment.apps/api         2/2     2            2           82s   api          python:3.13-alpine       app=api\ndeployment.apps/db          1/1     1            1           82s   postgres     postgres:17-alpine       app=db\ndeployment.apps/synthetic   1/1     1            1           82s   curl         curlimages/curl:8.17.0   app=synthetic\ndeployment.apps/web         2/2     2            2           82s   nginx        nginx:1.29-alpine        app=web\ndeployment.apps/worker      1/1     1            1           82s   worker       python:3.13-alpine       app=worker\n\nNAME                                   DESIRED   CURRENT   READY   AGE   CONTAINERS   IMAGES                   SELECTOR\nreplicaset.apps/api-7d87b9fcf5         0         0         0       82s   api          python:3.13-alpine       app=api,pod-template-hash=7d87b9fcf5\nreplicaset.apps/api-9fc94df4b          2         2         2       64s   api          python:3.13-alpine       app=api,pod-template-hash=9fc94df4b\nreplicaset.apps/db-5c45bf6fd6          1         1         1       82s   postgres     postgres:17-alpine       app=db,pod-template-hash=5c45bf6fd6\nreplicaset.apps/synthetic-5cc5f987df   1         1         1       82s   curl         curlimages/curl:8.17.0   app=synthetic,pod-template-hash=5cc5f987df\nreplicaset.apps/web-86cc98785b         2         2         2       82s   nginx        nginx:1.29-alpine        app=web,pod-template-hash=86cc98785b\nreplicaset.apps/worker-85767c58ff      1         1         1       82s   worker       python:3.13-alpine       app=worker,pod-template-hash=85767c58ff\n2026-11-03T07:19:15Z GET /orders 000\n2026-11-03T07:19:17Z GET /orders 000\n2026-11-03T07:19:19Z GET /orders 200\n2026-11-03T07:19:21Z GET /orders 200\n2026-11-03T07:19:23Z GET /orders 200\n2026-11-03T07:19:25Z GET /orders 200\n2026-11-03T07:19:27Z GET /orders 200\n2026-11-03T07:19:29Z GET /orders 200\n2026-11-03T07:19:31Z GET /orders 200\n2026-11-03T07:19:34Z GET /orders 503\n2026-11-03T07:19:37Z GET /orders 503\n2026-11-03T07:19:40Z GET /orders 503","more":18},{"t":5.3,"kind":"say","text":"The api rollout (new RS ~64s ago) lines up with the 503s starting. Let me check before undoing."},{"t":6.9,"kind":"run","cmd":"kubectl -n shop rollout history deploy/api; kubectl -n shop rollout history deploy/api --revision=1 ; kubectl -n shop rollout history deploy/api --revision=2; kubectl -n shop get endpoints; kubectl -n shop logs deploy/api --tail=20; kubectl -n shop logs deploy/web --tail=10; kubectl -n shop logs deploy/db --tail=10; date -u","out":"deployment.apps/api \nREVISION  CHANGE-CAUSE\n1         <none>\n2         release 2026.11.3: connection pool settings\n\ndeployment.apps/api with revision #1\nPod Template:\n  Labels:\tapp=api\n\tpod-template-hash=7d87b9fcf5\n  Containers:\n   api:\n    Image:\tpython:3.13-alpine\n    Port:\t8080/TCP\n    Host Port:\t0/TCP\n    Command:\n      python\n      -u\n      /app/api.py\n    Limits:\n      memory:\t128Mi\n    Requests:\n      cpu:\t50m\n      memory:\t64Mi\n    Readiness:\thttp-get http://:8080/healthz delay=0s timeout=1s period=5s successThreshold=1 failureThreshold=3\n    Environment Variables from:\n      api-config\tConfigMap\tOptional: false\n    Environment:\t<none>\n    Mounts:\n      /app from code (rw)\n  Volumes:\n   code:\n    Type:\tConfigMap (a volume populated by a ConfigMap)\n    Name:\tapi-code\n    Optional:\tfalse\n  Node-Selectors:\t<none>\n  Tolerations:\t<none>\n\ndeployment.apps/api with revision #2\nPod Template:\n  Labels:\tapp=api","more":71},{"t":8.8,"kind":"say","text":"Clear match: revision 2 set `DB_PORT=5433`, db listens on 5432 (Service port 5432). Rolling back per runbook."},{"t":9.6,"kind":"run","cmd":"kubectl -n shop rollout undo deploy/api && kubectl -n shop rollout status deploy/api --timeout=90s; kubectl -n shop logs deploy/api --tail=5","out":"Warning: resource deployments/api was previously managed with 'kubectl apply'. Rolling back will not update the kubectl.kubernetes.io/last-applied-configuration annotation, which may cause unexpected behavior on future 'kubectl apply' operations. Consider using 'kubectl apply' with your previous configuration file instead.\ndeployment.apps/api rolled back\nWaiting for deployment \"api\" rollout to finish: 1 out of 2 new replicas have been updated...\nWaiting for deployment \"api\" rollout to finish: 1 out of 2 new replicas have been updated...\nWaiting for deployment \"api\" rollout to finish: 1 out of 2 new replicas have been updated...\nWaiting for deployment \"api\" rollout to finish: 1 old replicas are pending termination...\nWaiting for deployment \"api\" rollout to finish: 1 old replicas are pending termination...\ndeployment \"api\" successfully rolled out\nFound 4 pods, using pod/api-9fc94df4b-gw78j\nERROR db connect db:5433: timed out\nERROR db connect db:5433: timed out\nERROR db connect db:5433: timed out\nERROR db connect db:5433: timed out\nERROR db connect db:5433: timed out","more":0},{"t":14.0,"kind":"run","cmd":"sleep 20; kubectl -n shop get pods -l app=api; for p in $(kubectl -n shop get pods -l app=api -o name); do echo == $p; kubectl -n shop logs $p --tail=3; done; kubectl -n shop logs deploy/synthetic --tail=12","out":"Exit code 1\nNAME                   READY   STATUS        RESTARTS   AGE\napi-7d87b9fcf5-blfpw   1/1     Running       0          24s\napi-7d87b9fcf5-zlxq7   1/1     Running       0          23s\napi-9fc94df4b-4sr5m    1/1     Terminating   0          93s\napi-9fc94df4b-gw78j    1/1     Terminating   0          94s\n(eval):1: = not found","more":0},{"t":36.2,"kind":"run","cmd":"sleep 15; kubectl -n shop get pods -l app=api; for p in $(kubectl -n shop get pods -l app=api -o name); do echo \"--- $p\"; kubectl -n shop logs $p --tail=3; done; kubectl -n shop logs deploy/synthetic --tail=12","out":"NAME                   READY   STATUS    RESTARTS   AGE\napi-7d87b9fcf5-blfpw   1/1     Running   0          42s\napi-7d87b9fcf5-zlxq7   1/1     Running   0          41s\n--- pod/api-7d87b9fcf5-blfpw\napi listening on 8080, db=db:5432\n--- pod/api-7d87b9fcf5-zlxq7\napi listening on 8080, db=db:5432\n2026-11-03T07:20:59Z GET /orders 200\n2026-11-03T07:21:01Z GET /orders 200\n2026-11-03T07:21:03Z GET /orders 200\n2026-11-03T07:21:05Z GET /orders 200\n2026-11-03T07:21:07Z GET /orders 200\n2026-11-03T07:21:09Z GET /orders 200\n2026-11-03T07:21:12Z GET /orders 200\n2026-11-03T07:21:14Z GET /orders 200\n2026-11-03T07:21:16Z GET /orders 200\n2026-11-03T07:21:18Z GET /orders 200\n2026-11-03T07:21:20Z GET /orders 200\n2026-11-03T07:21:22Z GET /orders 200","more":0}],"report":"Service is back up. The cause was the api release `2026.11.3`, which pointed the api at the wrong database port. I rolled it back, and every synthetic probe since 07:20:59Z has returned 200.\n\n**What happened**\n- The synthetic probe was getting 200s until 07:19:31Z. From 07:19:34Z every request to `/orders` returned 503. The two `000` results at 07:19:15–17Z came from the service starting up and don't belong to this incident.\n- Revision 2 of `deploy/api` (change-cause \"release 2026.11.3: connection pool settings\") was rolled out at about 07:19:34Z, the same moment the 503s began. It added the env var `DB_PORT=5433`.\n- The database listens on 5432, and so does `svc/db`. The api pods logged `ERROR db connect db:5433: timed out` over and over, so web returned 503 for every `/orders` request.\n- The api pods still showed Ready and stayed in the endpoints, because their readiness probe (`/healthz`) doesn't check the database connection. That's why Kubernetes never took them out of service.\n\n---\n\nIMPACT: Every `GET /orders` request through `web` failed with 503 from 07:19:34Z to about 07:20:57Z UTC (100% of requests for roughly 1.5 minutes). All customer order reads and listings went through this path. `worker` pulls jobs from `api`, so it probably couldn't get any during that window; I didn't check this.\n\nROOT CAUSE: Deployment/shop/api, `spec.template.spec.containers[name=api].env` — revision 2 (release 2026.11.3) added `DB_PORT=5433`, but `db` (Service and PostgreSQL) listens on 5432.\n\nACTIONS TAKEN:\n1. 07:20:4xZ — `kubectl -n shop rollout undo deploy/api` (revision 2 back to revision 1's pod template, which has no `DB_PORT` override). Waited for the rollout to finish.\n\nSTATUS: Resolved. Both new api pods (`api-7d87b9fcf5-*`) log `db=db:5432` and no connection errors. The old pods are gone. Every synthetic probe from 07:20:59Z through at least 07:21:22Z returned 200.\n\nESCALATION: None for the incident. The owners of release 2026.11.3 need to know it was rolled back and should fix `DB_PORT` before they re-release. Also, the rollback doesn't update the `kubectl.kubernetes.io/last-applied-configuration` annotation, so the next `kubectl apply` of the release manifest will bring `DB_PORT=5433` back unless the manifest is fixed in source.\n\nFOLLOW-UP: Make the api readiness probe check the database connection (or add a separate check that does). Then a rollout with a broken DB setting would never become Ready, and the old pods would keep serving instead of the bad version taking all the traffic."}