{"id":"s3-claude-sonnet-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":3.1,"kind":"run","cmd":"kubectl -n shop get pods,svc,endpoints,deploy; 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\npod/api-9fc94df4b-bwq6m          1/1     Running   0          60s\npod/api-9fc94df4b-zmswh          1/1     Running   0          65s\npod/db-5c45bf6fd6-89jbj          1/1     Running   0          84s\npod/synthetic-5cc5f987df-mw9px   1/1     Running   0          84s\npod/web-86cc98785b-hwc8h         1/1     Running   0          84s\npod/web-86cc98785b-r9jr5         1/1     Running   0          84s\npod/worker-85767c58ff-cldn4      1/1     Running   0          84s\n\nNAME          TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE\nservice/api   ClusterIP   10.96.109.189   <none>        8080/TCP   84s\nservice/db    ClusterIP   10.96.196.55    <none>        5432/TCP   84s\nservice/web   ClusterIP   10.96.221.92    <none>        80/TCP     84s\n\nNAME            ENDPOINTS                             AGE\nendpoints/api   10.244.0.244:8080,10.244.0.245:8080   84s\nendpoints/db    10.244.0.237:5432                     84s\nendpoints/web   10.244.0.241:80,10.244.0.242:80       84s\n\nNAME                        READY   UP-TO-DATE   AVAILABLE   AGE\ndeployment.apps/api         2/2     2            2           84s\ndeployment.apps/db          1/1     1            1           84s\ndeployment.apps/synthetic   1/1     1            1           84s\ndeployment.apps/web         2/2     2            2           84s\ndeployment.apps/worker      1/1     1            1           84s\n2026-11-03T07:16:43Z GET /orders 000\n2026-11-03T07:16:45Z GET /orders 200\n2026-11-03T07:16:47Z GET /orders 200\n2026-11-03T07:16:49Z GET /orders 200\n2026-11-03T07:16:51Z GET /orders 200\n2026-11-03T07:16:53Z GET /orders 200\n2026-11-03T07:16:55Z GET /orders 200\n2026-11-03T07:16:57Z GET /orders 200\n2026-11-03T07:16:59Z GET /orders 200\n2026-11-03T07:17:01Z GET /orders 200\n2026-11-03T07:17:04Z GET /orders 503\n2026-11-03T07:17:07Z GET /orders 503\n2026-11-03T07:17:10Z GET /orders 503\n2026-11-03T07:17:13Z GET /orders 503","more":16},{"t":3.7,"kind":"run","cmd":"for d in $(kubectl -n shop get deploy -o name); do echo $d; kubectl -n shop rollout history $d; done","out":"deployment.apps/api\ndeployment.apps/api \nREVISION  CHANGE-CAUSE\n1         <none>\n2         release 2026.11.3: connection pool settings\n\ndeployment.apps/db\ndeployment.apps/db \nREVISION  CHANGE-CAUSE\n1         <none>\n\ndeployment.apps/synthetic\ndeployment.apps/synthetic \nREVISION  CHANGE-CAUSE\n1         <none>\n\ndeployment.apps/web\ndeployment.apps/web \nREVISION  CHANGE-CAUSE\n1         <none>\n\ndeployment.apps/worker\ndeployment.apps/worker \nREVISION  CHANGE-CAUSE\n1         <none>","more":0},{"t":6.6,"kind":"say","text":"Api rev 2 is a candidate. Check logs and web before undoing."},{"t":7.4,"kind":"run","cmd":"kubectl -n shop logs deploy/web --tail=15; kubectl -n shop logs deploy/api --tail=20; kubectl -n shop logs deploy/db --tail=10; kubectl -n shop rollout history deploy/api --revision=2 | head -40","out":"Found 2 pods, using pod/web-86cc98785b-hwc8h\n10.244.0.243 - - [03/Nov/2026:07:17:22 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:25 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:25 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:28 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:30 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:31 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:34 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:35 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:40 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:43 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:45 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.243 - - [03/Nov/2026:07:17:49 +0000] \"GET /orders HTTP/1.1\" 503 33 \"-\" \"curl/8.17.0\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:50 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:17:55 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n10.244.0.1 - - [03/Nov/2026:07:18:00 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\nFound 2 pods, using pod/api-9fc94df4b-zmswh\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\nserver stopped\n\nPostgreSQL init process complete; ready for start up.\n\n2026-11-03 07:16:39.036 UTC [1] LOG:  starting PostgreSQL 17.11 on aarch64-unknown-linux-musl, compiled by gcc (Alpine 15.2.0) 15.2.0, 64-bit\n2026-11-03 07:16:39.036 UTC [1] LOG:  listening on IPv4 address \"0.0.0.0\", port 5432\n2026-11-03 07:16:39.036 UTC [1] LOG:  listening on IPv6 address \"::\", port 5432\n2026-11-03 07:16:39.037 UTC [1] LOG:  listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n2026-11-03 07:16:39.038 UTC [75] LOG:  database system was shut down at 2026-11-03 07:16:38 UTC\n2026-11-03 07:16:39.040 UTC [1] LOG:  database system is ready to accept connections\ndeployment.apps/api with revision #2\nPod Template:\n  Labels:\tapp=api","more":30},{"t":8.9,"kind":"say","text":"The rollout set DB_PORT=5433 on the api Deployment, but db listens on 5432. Undo matches the start time."},{"t":9.8,"kind":"run","cmd":"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=6; kubectl -n shop get deploy api -o jsonpath='{.spec.template.spec.containers[0].env}'; kubectl -n shop get cm api-config -o yaml | grep -A8 data","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\n2026-11-03T07:18:08Z GET /orders 503\n2026-11-03T07:18:10Z GET /orders 200\n2026-11-03T07:18:12Z GET /orders 200\n2026-11-03T07:18:14Z GET /orders 200\n2026-11-03T07:18:16Z GET /orders 200\n2026-11-03T07:18:18Z GET /orders 200\ndata:\n  DB_HOST: db\n  DB_PORT: \"5432\"\nkind: ConfigMap\nmetadata:\n  annotations:\n    kubectl.kubernetes.io/last-applied-configuration: |\n      {\"apiVersion\":\"v1\",\"data\":{\"DB_HOST\":\"db\",\"DB_PORT\":\"5432\"},\"kind\":\"ConfigMap\",\"metadata\":{\"annotations\":{},\"name\":\"api-config\",\"namespace\":\"shop\"}}\n  creationTimestamp: \"2026-11-03T07:16:38Z\"\n  name: api-config\n  namespace: shop\n  resourceVersion: \"56266\"\n  uid: 7a7cd272-3aa1-4f0d-a09a-24a00257c432","more":0}],"report":"**IMPACT:** `GET /orders` through `web` returned 503 for 100% of probes from about 07:17:04Z. The rollout of `api` revision 2 was the cause. Other paths weren't checked. The 07:16:43Z `000` was a single probe failure at startup.\n\n**ROOT CAUSE:** `Deployment/shop/api`, field `spec.template.spec.containers[0].env` (`DB_PORT=5433`). This was added in revision 2, \"release 2026.11.3: connection pool settings\". `db` listens on 5432, so the `api` pods timed out connecting to `db:5433`. The `api` pods still passed their readiness probes, so the broken pods stayed in service. `web` therefore returned 503.\n\n**ACTIONS TAKEN:**\n1. Ran `kubectl -n shop rollout undo deploy/api`, which went back to revision 1. The rollout finished successfully.\n\n**STATUS:** Resolved. `synthetic` has shown 200 on every probe since 07:18:10Z (the 07:18:08Z probe was a 503, during the rollout). The `api-config` ConfigMap has `DB_PORT=5432`, which matches the port `db` listens on.\n\n**ESCALATION:** None.\n\n**FOLLOW-UP:** Change the `api` readiness probe so it checks DB connectivity, not just `/healthz`. A bad DB setting would then fail the rollout instead of reaching users. Also fix the release manifest so it no longer sets `DB_PORT=5433`. The rollback didn't update the `kubectl.kubernetes.io/last-applied-configuration` annotation, so the next `kubectl apply` of that manifest would redeploy the bad port."}