{"id":"s3-claude-sonnet-5-5-r2","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/`.\n If a rollout matches the start time, `kubectl -n shop rollout undo deploy/`.\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":2.8,"kind":"run","cmd":"kubectl -n shop get pods,deploy,svc,endpoints -o wide; kubectl -n shop logs deploy/synthetic --tail=30","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES\npod/api-9fc94df4b-8dtgl 1/1 Running 0 65s 10.244.0.96 oncall-lab-control-plane \npod/api-9fc94df4b-tnnx8 1/1 Running 0 64s 10.244.0.97 oncall-lab-control-plane \npod/db-5c45bf6fd6-xr7qg 1/1 Running 0 83s 10.244.0.89 oncall-lab-control-plane \npod/synthetic-5cc5f987df-8ff74 1/1 Running 0 83s 10.244.0.95 oncall-lab-control-plane \npod/web-86cc98785b-fbznd 1/1 Running 0 83s 10.244.0.93 oncall-lab-control-plane \npod/web-86cc98785b-lzrml 1/1 Running 0 83s 10.244.0.94 oncall-lab-control-plane \npod/worker-85767c58ff-jfjxb 1/1 Running 0 83s 10.244.0.92 oncall-lab-control-plane \n\nNAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR\ndeployment.apps/api 2/2 2 2 83s api python:3.13-alpine app=api\ndeployment.apps/db 1/1 1 1 83s postgres postgres:17-alpine app=db\ndeployment.apps/synthetic 1/1 1 1 83s curl curlimages/curl:8.17.0 app=synthetic\ndeployment.apps/web 2/2 2 2 83s nginx nginx:1.29-alpine app=web\ndeployment.apps/worker 1/1 1 1 83s worker python:3.13-alpine app=worker\n\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR\nservice/api ClusterIP 10.96.170.218 8080/TCP 83s app=api\nservice/db ClusterIP 10.96.50.130 5432/TCP 83s app=db\nservice/web ClusterIP 10.96.181.239 80/TCP 83s app=web\n\nNAME ENDPOINTS AGE\nendpoints/api 10.244.0.96:8080,10.244.0.97:8080 83s\nendpoints/db 10.244.0.89:5432 83s\nendpoints/web 10.244.0.93:80,10.244.0.94:80 83s\n2026-11-03T06:30:10Z GET /orders 000\n2026-11-03T06:30:12Z GET /orders 000\n2026-11-03T06:30:14Z GET /orders 000\n2026-11-03T06:30:16Z GET /orders 200\n2026-11-03T06:30:18Z GET /orders 200\n2026-11-03T06:30:20Z GET /orders 200\n2026-11-03T06:30:22Z GET /orders 200\n2026-11-03T06:30:24Z GET /orders 200\n2026-11-03T06:30:26Z GET /orders 200\n2026-11-03T06:30:29Z GET /orders 503\n2026-11-03T06:30:32Z GET /orders 503\n2026-11-03T06:30:35Z GET /orders 503\n2026-11-03T06:30:38Z GET /orders 503\n2026-11-03T06:30:41Z GET /orders 503","more":16},{"t":3.3,"kind":"run","cmd":"for d in web api db worker events-writer; do echo \"== $d\"; kubectl -n shop rollout history deploy/$d 2>&1 | tail -5; done","out":"== web\ndeployment.apps/web \nREVISION CHANGE-CAUSE\n1 \n\n== api\ndeployment.apps/api \nREVISION CHANGE-CAUSE\n1 \n2 release 2026.11.3: connection pool settings\n\n== db\ndeployment.apps/db \nREVISION CHANGE-CAUSE\n1 \n\n== worker\ndeployment.apps/worker \nREVISION CHANGE-CAUSE\n1 \n\n== events-writer\nError from server (NotFound): deployments.apps \"events-writer\" not found","more":0},{"t":6.3,"kind":"say","text":"The api rollout (revision 2) is a candidate. I'll check the logs and the diff between the revisions first."},{"t":7.5,"kind":"run","cmd":"cd /tmp; kubectl -n shop logs deploy/api --tail=15; kubectl -n shop logs deploy/web --tail=10; kubectl -n shop rollout history deploy/api --revision=1 | grep -iE \"env|value|image|name\" ; echo ---; kubectl -n shop rollout history deploy/api --revision=2 | grep -iE \"env|value|image|name\"; kubectl -n shop get deploy api -o yaml | grep -A25 \"env:\"","out":"setValueForKeyFakeAssocArray:27: command not found: _encode\nsetValueForKeyFakeAssocArray:27: command not found: _encode\nsetValueForKeyFakeAssocArray:27: command not found: _encode\nsetValueForKeyFakeAssocArray:27: command not found: _encode\nsetValueForKeyFakeAssocArray:27: command not found: _encode\nsetValueForKeyFakeAssocArray:27: command not found: _encode\nvalueForKeyFakeAssocArray:28: command not found: _decode\nvalueForKeyFakeAssocArray:28: command not found: _decode\nFound 2 pods, using pod/api-9fc94df4b-8dtgl\napi listening on 8080, db=db:5433\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\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\nERROR db connect db:5433: timed out\nERROR db connect db:5433: timed out\nFound 2 pods, using pod/web-86cc98785b-fbznd\n10.244.0.95 - - [03/Nov/2026:06:31:08 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:06:31:10 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.1 - - [03/Nov/2026:06:31:15 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.1 - - [03/Nov/2026:06:31:20 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.95 - - [03/Nov/2026:06:31:20 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.95 - - [03/Nov/2026:06:31:23 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:06:31:25 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.95 - - [03/Nov/2026:06:31:29 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:06:31:30 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.95 - - [03/Nov/2026:06:31:32 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n Image:\tpython:3.13-alpine\n Environment Variables from:\n Environment:\t\n Name:\tapi-code\n---\n Image:\tpython:3.13-alpine\n Environment Variables from:","more":29},{"t":9.5,"kind":"say","text":"Revision 2 added `DB_PORT=5433`, but the db listens on 5432. That matches the 06:30:29 start, so I'll roll back per the runbook."},{"t":10.3,"kind":"run","cmd":"kubectl -n shop get cm api-config -o jsonpath='{.data}'; echo; kubectl -n shop rollout undo deploy/api && kubectl -n shop rollout status deploy/api --timeout=90s; sleep 10; kubectl -n shop logs deploy/synthetic --tail=5 2>/dev/null","out":"{\"DB_HOST\":\"db\",\"DB_PORT\":\"5432\"}\nWarning: 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\n2026-11-03T06:31:43Z GET /orders 200\n2026-11-03T06:31:45Z GET /orders 200\n2026-11-03T06:31:48Z GET /orders 200\n2026-11-03T06:31:50Z GET /orders 200\n2026-11-03T06:31:52Z GET /orders 200","more":0}],"report":"**IMPACT:** All `GET /orders` requests through `web` returned 503 from 06:30:29Z until the rollback at about 06:31:40Z. The error rate was 100% for that period. No data was affected.\n\n**ROOT CAUSE:** `Deployment/shop/api`, field `spec.template.spec.containers[api].env`. Revision 2 (\"release 2026.11.3: connection pool settings\") added `DB_PORT=5433`. This overrode the `api-config` ConfigMap value of 5432, which is the port `db` listens on. The api pods stayed Ready because `/healthz` doesn't touch the db, and every db connection timed out.\n\n**ACTIONS TAKEN:**\n1. Ran read-only checks: pods, endpoints, `synthetic` and `api` logs, and rollout history.\n2. Ran `kubectl -n shop rollout undo deploy/api`, which removed the `DB_PORT=5433` override. The rollout completed with 2/2 replicas.\n\n**STATUS:** Resolved. `synthetic` has logged 200 on every probe from 06:31:43Z onward, which is the last 5 probes I checked. `web`, `db` and `worker` were not changed.\n\n**ESCALATION:** None.\n\n**FOLLOW-UP:** Remove the hardcoded `DB_PORT` from the api Deployment manifest in source control so the ConfigMap is the single source of truth. Before the \"connection pool settings\" release is redeployed, make its `DB_PORT` match the ConfigMap. Also make api's readiness probe check the db connection, so a bad db setting stops the rollout instead of reaching traffic.\n\nThe `kubectl apply` last-applied annotation on `api` is now out of sync with the live object, as `kubectl` warned. Apply the corrected manifest to fix that."}