{"id":"s8-gpt-6-1-terra-r1","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":4.2,"kind":"say","text":"I’ll establish when the failures began, compare that with recent rollouts, and check the service path before making changes."},{"t":4.3,"kind":"run","cmd":"kubectl -n shop get deploy -o name","out":"deployment.apps/api\ndeployment.apps/db\ndeployment.apps/synthetic\ndeployment.apps/web\ndeployment.apps/worker","more":0},{"t":4.3,"kind":"run","cmd":"kubectl -n shop get events --sort-by=.lastTimestamp","out":"LAST SEEN   TYPE      REASON              OBJECT                            MESSAGE\n82s         Normal    ScalingReplicaSet   deployment/db                     Scaled up replica set db-5c45bf6fd6 from 0 to 1\n82s         Normal    ScalingReplicaSet   deployment/worker                 Scaled up replica set worker-85767c58ff from 0 to 1\n82s         Normal    SuccessfulCreate    replicaset/worker-85767c58ff      Created pod: worker-85767c58ff-2hsg6\n82s         Normal    Scheduled           pod/worker-85767c58ff-2hsg6       Successfully assigned shop/worker-85767c58ff-2hsg6 to oncall-lab-control-plane\n82s         Normal    ScalingReplicaSet   deployment/web                    Scaled up replica set web-86cc98785b from 0 to 2\n82s         Normal    Scheduled           pod/api-7d87b9fcf5-ksrlf          Successfully assigned shop/api-7d87b9fcf5-ksrlf to oncall-lab-control-plane\n82s         Normal    SuccessfulCreate    replicaset/web-86cc98785b         Created pod: web-86cc98785b-vwdqq\n82s         Normal    SuccessfulCreate    replicaset/web-86cc98785b         Created pod: web-86cc98785b-dzrvx\n82s         Normal    Scheduled           pod/web-86cc98785b-vwdqq          Successfully assigned shop/web-86cc98785b-vwdqq to oncall-lab-control-plane\n82s         Normal    Scheduled           pod/api-7d87b9fcf5-7gqqg          Successfully assigned shop/api-7d87b9fcf5-7gqqg to oncall-lab-control-plane\n82s         Normal    SuccessfulCreate    replicaset/api-7d87b9fcf5         Created pod: api-7d87b9fcf5-ksrlf\n82s         Normal    SuccessfulCreate    replicaset/api-7d87b9fcf5         Created pod: api-7d87b9fcf5-7gqqg\n82s         Normal    ScalingReplicaSet   deployment/api                    Scaled up replica set api-7d87b9fcf5 from 0 to 2\n82s         Normal    Scheduled           pod/db-5c45bf6fd6-zg4jp           Successfully assigned shop/db-5c45bf6fd6-zg4jp to oncall-lab-control-plane\n82s         Normal    Scheduled           pod/web-86cc98785b-dzrvx          Successfully assigned shop/web-86cc98785b-dzrvx to oncall-lab-control-plane\n82s         Normal    ScalingReplicaSet   deployment/synthetic              Scaled up replica set synthetic-5cc5f987df from 0 to 1\n82s         Normal    SuccessfulCreate    replicaset/synthetic-5cc5f987df   Created pod: synthetic-5cc5f987df-9pfhf\n82s         Normal    Scheduled           pod/synthetic-5cc5f987df-9pfhf    Successfully assigned shop/synthetic-5cc5f987df-9pfhf to oncall-lab-control-plane\n82s         Normal    SuccessfulCreate    replicaset/db-5c45bf6fd6          Created pod: db-5c45bf6fd6-zg4jp\n81s         Normal    Pulled              pod/web-86cc98785b-dzrvx          Container image \"nginx:1.29-alpine\" already present on machine and can be accessed by the pod\n81s         Normal    Pulled              pod/worker-85767c58ff-2hsg6       Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod\n81s         Normal    Pulled              pod/synthetic-5cc5f987df-9pfhf    Container image \"curlimages/curl:8.17.0\" already present on machine and can be accessed by the pod\n81s         Normal    Created             pod/synthetic-5cc5f987df-9pfhf    Container created\n81s         Normal    Started             pod/synthetic-5cc5f987df-9pfhf    Container started\n81s         Normal    Started             pod/db-5c45bf6fd6-zg4jp           Container started\n81s         Normal    Created             pod/db-5c45bf6fd6-zg4jp           Container created\n81s         Normal    Pulled              pod/api-7d87b9fcf5-7gqqg          Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod\n81s         Normal    Created             pod/api-7d87b9fcf5-7gqqg          Container created\n81s         Normal    Started             pod/worker-85767c58ff-2hsg6       Container started\n81s         Normal    Created             pod/worker-85767c58ff-2hsg6       Container created\n81s         Warning   Unhealthy           pod/db-5c45bf6fd6-zg4jp           Readiness pr","more":38},{"t":4.3,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --since=2h --timestamps --tail=300","out":"2026-11-04T16:08:33.198184386Z 2026-11-04T16:08:33Z GET /orders 000\n2026-11-04T16:08:35.208975550Z 2026-11-04T16:08:35Z GET /orders 000\n2026-11-04T16:08:37.213108900Z 2026-11-04T16:08:37Z GET /orders 000\n2026-11-04T16:08:39.223656498Z 2026-11-04T16:08:39Z GET /orders 200\n2026-11-04T16:08:41.236327600Z 2026-11-04T16:08:41Z GET /orders 200\n2026-11-04T16:08:43.251636920Z 2026-11-04T16:08:43Z GET /orders 200\n2026-11-04T16:08:45.265109381Z 2026-11-04T16:08:45Z GET /orders 200\n2026-11-04T16:08:47.274188505Z 2026-11-04T16:08:47Z GET /orders 200\n2026-11-04T16:08:49.282185985Z 2026-11-04T16:08:49Z GET /orders 200\n2026-11-04T16:08:55.293156967Z 2026-11-04T16:08:55Z GET /orders 000\n2026-11-04T16:08:59.311488721Z 2026-11-04T16:08:59Z GET /orders 504\n2026-11-04T16:09:03.339131045Z 2026-11-04T16:09:03Z GET /orders 504\n2026-11-04T16:09:07.352718509Z 2026-11-04T16:09:07Z GET /orders 504\n2026-11-04T16:09:11.361365602Z 2026-11-04T16:09:11Z GET /orders 504\n2026-11-04T16:09:15.371999751Z 2026-11-04T16:09:15Z GET /orders 504\n2026-11-04T16:09:19.378200199Z 2026-11-04T16:09:19Z GET /orders 504\n2026-11-04T16:09:23.392500834Z 2026-11-04T16:09:23Z GET /orders 504\n2026-11-04T16:09:27.404427910Z 2026-11-04T16:09:27Z GET /orders 504\n2026-11-04T16:09:31.419723970Z 2026-11-04T16:09:31Z GET /orders 504\n2026-11-04T16:09:35.439044145Z 2026-11-04T16:09:35Z GET /orders 504\n2026-11-04T16:09:39.458537865Z 2026-11-04T16:09:39Z GET /orders 504\n2026-11-04T16:09:43.484193340Z 2026-11-04T16:09:43Z GET /orders 504\n2026-11-04T16:09:47.492016016Z 2026-11-04T16:09:47Z GET /orders 504\n2026-11-04T16:09:51.502254463Z 2026-11-04T16:09:51Z GET /orders 504","more":0},{"t":4.3,"kind":"run","cmd":"kubectl -n shop get deploy,pods,svc,endpoints -o wide","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\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      0/1     1            0           82s   worker       python:3.13-alpine       app=worker\n\nNAME                             READY   STATUS      RESTARTS      AGE   IP            NODE                       NOMINATED NODE   READINESS GATES\npod/api-7d87b9fcf5-7gqqg         1/1     Running     0             82s   10.244.0.41   oncall-lab-control-plane   <none>           <none>\npod/api-7d87b9fcf5-ksrlf         1/1     Running     0             82s   10.244.0.40   oncall-lab-control-plane   <none>           <none>\npod/db-5c45bf6fd6-zg4jp          1/1     Running     0             82s   10.244.0.39   oncall-lab-control-plane   <none>           <none>\npod/synthetic-5cc5f987df-9pfhf   1/1     Running     0             82s   10.244.0.45   oncall-lab-control-plane   <none>           <none>\npod/web-765c764598-frtpg         1/1     Running     0             64s   10.244.0.47   oncall-lab-control-plane   <none>           <none>\npod/web-765c764598-kvjhf         1/1     Running     0             64s   10.244.0.48   oncall-lab-control-plane   <none>           <none>\npod/worker-8d9d856dd-gss88       0/1     OOMKilled   3 (50s ago)   65s   10.244.0.46   oncall-lab-control-plane   <none>           <none>\n\nNAME          TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE   SELECTOR\nservice/api   ClusterIP   10.96.83.136    <none>        8080/TCP   82s   app=api\nservice/db    ClusterIP   10.96.121.121   <none>        5432/TCP   82s   app=db\nservice/web   ClusterIP   10.96.102.111   <none>        80/TCP     82s   app=web\n\nNAME            ENDPOINTS                           AGE\nendpoints/api   10.244.0.40:8080,10.244.0.41:8080   82s\nendpoints/db    10.244.0.39:5432                    82s\nendpoints/web   10.244.0.47:80,10.244.0.48:80       82s","more":0},{"t":10.1,"kind":"say","text":"The probe was returning 200 until 16:08:49 UTC, then timed out and began returning 504s. A web rollout occurred at the same time; the worker is also being OOM-killed. I’m checking the revisions and backend logs."},{"t":10.2,"kind":"run","cmd":"kubectl -n shop logs worker-8d9d856dd-gss88 --previous --timestamps","out":"unable to retrieve container logs for containerd://9673c53caa5dadcfc139bc6dd0bee901cc972e0fa6304a1a62699c9a82035781","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop get rs -o wide","out":"NAME                   DESIRED   CURRENT   READY   AGE   CONTAINERS   IMAGES                   SELECTOR\napi-7d87b9fcf5         2         2         2       88s   api          python:3.13-alpine       app=api,pod-template-hash=7d87b9fcf5\ndb-5c45bf6fd6          1         1         1       88s   postgres     postgres:17-alpine       app=db,pod-template-hash=5c45bf6fd6\nsynthetic-5cc5f987df   1         1         1       88s   curl         curlimages/curl:8.17.0   app=synthetic,pod-template-hash=5cc5f987df\nweb-765c764598         2         2         2       70s   nginx        nginx:1.29-alpine        app=web,pod-template-hash=765c764598\nweb-86cc98785b         0         0         0       88s   nginx        nginx:1.29-alpine        app=web,pod-template-hash=86cc98785b\nworker-85767c58ff      0         0         0       88s   worker       python:3.13-alpine       app=worker,pod-template-hash=85767c58ff\nworker-8d9d856dd       1         1         0       71s   worker       python:3.13-alpine       app=worker,pod-template-hash=8d9d856dd","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/web","out":"deployment.apps/web \nREVISION  CHANGE-CAUSE\n1         <none>\n2         release 2026.11.3: edge routing for orders-v2","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop describe pod worker-8d9d856dd-gss88","out":"Name:             worker-8d9d856dd-gss88\nNamespace:        shop\nPriority:         0\nService Account:  default\nNode:             oncall-lab-control-plane/172.22.0.2\nStart Time:       Wed, 04 Nov 2026 16:08:48 +0000\nLabels:           app=worker\n                  pod-template-hash=8d9d856dd\nAnnotations:      <none>\nStatus:           Running\nIP:               10.244.0.46\nIPs:\n  IP:           10.244.0.46\nControlled By:  ReplicaSet/worker-8d9d856dd\nContainers:\n  worker:\n    Container ID:  containerd://f04066257cd7dbbc2f25fdf8a7520668c00464ec43b7aaf16e8ad47e4a7f1eac\n    Image:         python:3.13-alpine\n    Image ID:      docker.io/library/python@sha256:7984cf56ceaddebe4fefeb75d64000b9f45d8b77b11a09b24524da6cdc3af0c8\n    Port:          <none>\n    Host Port:     <none>\n    Command:\n      python\n      -u\n      /app/worker.py\n    State:          Terminated\n      Reason:       OOMKilled\n      Exit Code:    137\n      Started:      Wed, 04 Nov 2026 16:09:29 +0000\n      Finished:     Wed, 04 Nov 2026 16:09:30 +0000\n    Last State:     Terminated\n      Reason:       OOMKilled\n      Exit Code:    137\n      Started:      Wed, 04 Nov 2026 16:09:02 +0000\n      Finished:     Wed, 04 Nov 2026 16:09:03 +0000\n    Ready:          False\n    Restart Count:  3\n    Limits:\n      memory:  192Mi\n    Requests:","more":37},{"t":10.2,"kind":"run","cmd":"kubectl -n shop logs deploy/db --tail=100 --timestamps","out":"2026-11-04T16:08:32.189333461Z The files belonging to this database system will be owned by user \"postgres\".\n2026-11-04T16:08:32.189347378Z This user must also own the server process.\n2026-11-04T16:08:32.189348461Z \n2026-11-04T16:08:32.190271926Z The database cluster will be initialized with locale \"en_US.utf8\".\n2026-11-04T16:08:32.190281885Z The default database encoding has accordingly been set to \"UTF8\".\n2026-11-04T16:08:32.190283301Z The default text search configuration will be set to \"english\".\n2026-11-04T16:08:32.190283801Z \n2026-11-04T16:08:32.190284468Z Data page checksums are disabled.\n2026-11-04T16:08:32.190284885Z \n2026-11-04T16:08:32.190285343Z fixing permissions on existing directory /var/lib/postgresql/data/pgdata ... ok\n2026-11-04T16:08:32.190285885Z creating subdirectories ... ok\n2026-11-04T16:08:32.190286343Z selecting dynamic shared memory implementation ... posix\n2026-11-04T16:08:32.200234128Z selecting default \"max_connections\" ... 100\n2026-11-04T16:08:32.213137436Z selecting default \"shared_buffers\" ... 128MB\n2026-11-04T16:08:32.256215895Z selecting default time zone ... UTC\n2026-11-04T16:08:32.256510980Z creating configuration files ... ok\n2026-11-04T16:08:32.313912341Z running bootstrap script ... ok\n2026-11-04T16:08:32.421655549Z sh: locale: not found\n2026-11-04T16:08:32.421670466Z 2026-11-04 16:08:32.421 UTC [49] WARNING:  no usable system locales were found\n2026-11-04T16:08:32.570063196Z performing post-bootstrap initialization ... ok\n2026-11-04T16:08:32.572492340Z syncing data to disk ... ok\n2026-11-04T16:08:32.572497007Z initdb: warning: enabling \"trust\" authentication for local connections\n2026-11-04T16:08:32.572502299Z initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb.\n2026-11-04T16:08:32.572498590Z \n2026-11-04T16:08:32.572504882Z \n2026-11-04T16:08:32.572505882Z Success. You can now start the database server using:\n2026-11-04T16:08:32.572506465Z \n2026-11-04T16:08:32.572506924Z     pg_ctl -D /var/lib/postgresql/data/pgdata -l logfile start\n2026-11-04T16:08:32.572507382Z \n2026-11-04T16:08:32.591715989Z waiting for server to start....2026-11-04 16:08:32.591 UTC [55] LOG:  starting PostgreSQL 17.11 on aarch64-unknown-linux-musl, compiled by gcc (Alpine 15.2.0) 15.2.0, 64-bit\n2026-11-04T16:08:32.592876081Z 2026-11-04 16:08:32.592 UTC [55] LOG:  listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n2026-11-04T16:08:32.593799755Z 2026-11-04 16:08:32.593 UTC [58] LOG:  database system was shut down at 2026-11-04 16:08:32 UTC\n2026-11-04T16:08:32.595358350Z 2026-11-04 16:08:32.595 UTC [55] LOG:  database system is ready to accept connections\n2026-11-04T16:08:32.683190821Z  done\n2026-11-04T16:08:32.683207071Z server started\n2026-11-04T16:08:32.689872539Z \n2026-11-04T16:08:32.689884040Z /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*\n2026-11-04T16:08:32.689884748Z \n2026-11-04T16:08:32.690200917Z waiting for server to shut down....2026-11-04 16:08:32.690 UTC [55] LOG:  received fast shutdown request\n2026-11-04T16:08:32.690205209Z 2026-11-04 16:08:32.690 UTC [55] LOG:  aborting any active transactions","more":16},{"t":10.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/db","out":"deployment.apps/db \nREVISION  CHANGE-CAUSE\n1         <none>","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/api","out":"deployment.apps/api \nREVISION  CHANGE-CAUSE\n1         <none>","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/worker","out":"deployment.apps/worker \nREVISION  CHANGE-CAUSE\n1         <none>\n2         <none>","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop logs deploy/api --all-pods=true --tail=100 --timestamps","out":"[pod/api-7d87b9fcf5-7gqqg/api] 2026-11-04T16:08:32.444155014Z api listening on 8080, db=db:5432\n[pod/api-7d87b9fcf5-ksrlf/api] 2026-11-04T16:08:32.434661108Z api listening on 8080, db=db:5432","more":0},{"t":10.2,"kind":"run","cmd":"kubectl -n shop logs deploy/web --all-pods=true --tail=100 --timestamps","out":"[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.441681502Z /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.441693502Z /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.442076380Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.442802719Z 10-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.442883053Z /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.442940804Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.444336439Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.444949527Z /docker-entrypoint.sh: Configuration complete; ready for start up\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.452982339Z 2026/11/04 16:08:49 [notice] 1#1: using the \"epoll\" event method\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.452991506Z 2026/11/04 16:08:49 [notice] 1#1: nginx/1.29.8\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.452999548Z 2026/11/04 16:08:49 [notice] 1#1: built by gcc 15.2.0 (Alpine 15.2.0) \n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453000214Z 2026/11/04 16:08:49 [notice] 1#1: OS: Linux 6.8.0-117-generic\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453001423Z 2026/11/04 16:08:49 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1073741816:1073741816\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453004964Z 2026/11/04 16:08:49 [notice] 1#1: start worker processes\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453096132Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 28\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453156382Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 29\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453216591Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 30\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453486260Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 31\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453489343Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 32\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453490093Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 33\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453490551Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 34\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.453491010Z 2026/11/04 16:08:49 [notice] 1#1: start worker process 35\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:49.843639175Z 10.244.0.1 - - [04/Nov/2026:16:08:49 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:54.844537651Z 10.244.0.1 - - [04/Nov/2026:16:08:54 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:08:59.844467886Z 10.244.0.1 - - [04/Nov/2026:16:08:59 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:09:04.844430554Z 10.244.0.1 - - [04/Nov/2026:16:09:04 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:09:07.350451534Z 2026/11/04 16:09:07 [error] 33#33: *9 upstream timed out (110: Operation timed out) while connecting to upstream, client: 10.244.0.45, server: , request: \"GET /orders HTTP/1.1\", upstream: \"http://10.96.200.200:8080/orders\", host: \"web\"\n[pod/web-765c764598-frtpg/nginx] 2026-11-04T16:09:07.350655868Z 10.244.0.45 - - [04/Nov/2026:16:09:07 +0000] ","more":62},{"t":13.9,"kind":"say","text":"Web revision 2 coincides with the failure and nginx is timing out against `10.96.200.200:8080`, not the API Service’s IP. I’m rolling back the matching web rollout as directed."},{"t":14.0,"kind":"run","cmd":"kubectl -n shop rollout undo deploy/web","out":"Warning: resource deployments/web 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/web rolled back","more":0},{"t":17.6,"kind":"run","cmd":"kubectl -n shop get deploy worker -o yaml","out":"apiVersion: apps/v1\nkind: Deployment\nmetadata:\n  annotations:\n    deployment.kubernetes.io/revision: \"2\"\n    kubectl.kubernetes.io/last-applied-configuration: |\n      {\"apiVersion\":\"apps/v1\",\"kind\":\"Deployment\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"worker\"},\"name\":\"worker\",\"namespace\":\"shop\"},\"spec\":{\"replicas\":1,\"selector\":{\"matchLabels\":{\"app\":\"worker\"}},\"template\":{\"metadata\":{\"labels\":{\"app\":\"worker\"}},\"spec\":{\"containers\":[{\"command\":[\"python\",\"-u\",\"/app/worker.py\"],\"env\":[{\"name\":\"BATCH_MB\",\"value\":\"64\"}],\"image\":\"python:3.13-alpine\",\"name\":\"worker\",\"resources\":{\"limits\":{\"memory\":\"192Mi\"},\"requests\":{\"cpu\":\"50m\",\"memory\":\"96Mi\"}},\"volumeMounts\":[{\"mountPath\":\"/app\",\"name\":\"code\"}]}],\"volumes\":[{\"configMap\":{\"name\":\"api-code\"},\"name\":\"code\"}]}}}}\n  creationTimestamp: \"2026-11-04T16:08:31Z\"\n  generation: 2\n  labels:\n    app: worker\n  name: worker\n  namespace: shop\n  resourceVersion: \"287028\"\n  uid: 30fc87fa-7d61-43fb-852f-35f52638df98\nspec:\n  progressDeadlineSeconds: 600\n  replicas: 1\n  revisionHistoryLimit: 10\n  selector:\n    matchLabels:\n      app: worker\n  strategy:\n    rollingUpdate:\n      maxSurge: 25%\n      maxUnavailable: 25%\n    type: RollingUpdate\n  template:\n    metadata:\n      labels:\n        app: worker\n    spec:\n      containers:\n      - command:\n        - python\n        - -u\n        - /app/worker.py\n        env:\n        - name: BATCH_MB\n          value: \"230\"","more":43},{"t":17.6,"kind":"run","cmd":"kubectl -n shop get configmap -o yaml","out":"apiVersion: v1\nitems:\n- apiVersion: v1\n  data:\n    api.py: |\n      import os, socket, sys, json, time\n      from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\n      host = os.environ.get(\"DB_HOST\")\n      port = int(os.environ.get(\"DB_PORT\", \"5432\"))\n      if not host:\n          print(\"FATAL: DB_HOST is not set; check ConfigMap api-config\", flush=True)\n          sys.exit(1)\n      def db_ok():\n          try:\n              with socket.create_connection((host, port), timeout=1.0):\n                  return True\n          except OSError as e:\n              print(f\"ERROR db connect {host}:{port}: {e}\", flush=True)\n              return False\n      class H(BaseHTTPRequestHandler):\n          def log_message(self, *a): pass\n          def send(self, code, body):\n              b = json.dumps(body).encode()\n              self.send_response(code); self.send_header(\"Content-Type\", \"application/json\")\n              self.send_header(\"Content-Length\", str(len(b))); self.end_headers(); self.wfile.write(b)\n          def do_GET(self):\n              if self.path == \"/healthz\":\n                  return self.send(200, {\"ok\": True})\n              if self.path.startswith(\"/orders\"):\n                  if db_ok():\n                      return self.send(200, {\"orders\": [{\"id\": 1, \"total\": 42}]})\n                  return self.send(503, {\"error\": \"database unavailable\"})\n              if self.path == \"/jobs\":\n                  return self.send(200, {\"jobs\": [{\"id\": int(time.time())}]})\n              self.send(404, {\"error\": \"not found\"})\n      print(f\"api listening on 8080, db={host}:{port}\", flush=True)\n      ThreadingHTTPServer((\"\", 8080), H).serve_forever()\n    worker.py: |\n      import os, time, urllib.request\n      mb = int(os.environ.get(\"BATCH_MB\", \"64\"))","more":101},{"t":17.6,"kind":"run","cmd":"kubectl -n shop logs worker-8d9d856dd-gss88 --timestamps --tail=50","out":"2026-11-04T16:09:30.016298379Z worker started, batch buffer 230 MiB","more":0},{"t":17.6,"kind":"run","cmd":"kubectl -n shop rollout status deploy/web --timeout=90s","out":"deployment \"web\" successfully rolled out","more":0},{"t":17.6,"kind":"run","cmd":"kubectl -n shop rollout history deploy/web --revision=2","out":"deployment.apps/web with revision #2\nPod Template:\n  Labels:\tapp=web\n\tpod-template-hash=765c764598\n  Annotations:\tkubernetes.io/change-cause: release 2026.11.3: edge routing for orders-v2\n  Containers:\n   nginx:\n    Image:\tnginx:1.29-alpine\n    Port:\t80/TCP\n    Host Port:\t0/TCP\n    Readiness:\thttp-get http://:80/healthz delay=0s timeout=1s period=5s successThreshold=1 failureThreshold=3\n    Environment:\t<none>\n    Mounts:\n      /etc/nginx/conf.d from conf (rw)\n  Volumes:\n   conf:\n    Type:\tConfigMap (a volume populated by a ConfigMap)\n    Name:\tweb-nginx-v3\n    Optional:\tfalse\n  Node-Selectors:\t<none>\n  Tolerations:\t<none>","more":0},{"t":22.2,"kind":"say","text":"The web rollback has completed. Separately, the worker allocates a 230 MiB buffer under a 192 MiB limit; I’ll raise its limit to 320 MiB, within the runbook’s 512 MiB allowance, and verify batch processing."},{"t":22.2,"kind":"run","cmd":"kubectl -n shop set resources deployment/worker -c worker --limits=memory=320Mi","out":"deployment.apps/worker resource requirements updated","more":0},{"t":25.4,"kind":"run","cmd":"kubectl -n shop get deploy web -o jsonpath='{.spec.template.spec.volumes}'","out":"[{\"configMap\":{\"defaultMode\":420,\"name\":\"web-nginx\"},\"name\":\"conf\"}]","more":0},{"t":25.4,"kind":"run","cmd":"kubectl -n shop get pods,endpoints -o wide","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-7d87b9fcf5-7gqqg         1/1     Running   0          103s   10.244.0.41   oncall-lab-control-plane   <none>           <none>\npod/api-7d87b9fcf5-ksrlf         1/1     Running   0          103s   10.244.0.40   oncall-lab-control-plane   <none>           <none>\npod/db-5c45bf6fd6-zg4jp          1/1     Running   0          103s   10.244.0.39   oncall-lab-control-plane   <none>           <none>\npod/synthetic-5cc5f987df-9pfhf   1/1     Running   0          103s   10.244.0.45   oncall-lab-control-plane   <none>           <none>\npod/web-86cc98785b-nrpsw         1/1     Running   0          10s    10.244.0.50   oncall-lab-control-plane   <none>           <none>\npod/web-86cc98785b-q458m         1/1     Running   0          11s    10.244.0.49   oncall-lab-control-plane   <none>           <none>\npod/worker-6644689959-8pwzm      1/1     Running   0          3s     10.244.0.51   oncall-lab-control-plane   <none>           <none>\n\nNAME            ENDPOINTS                           AGE\nendpoints/api   10.244.0.40:8080,10.244.0.41:8080   103s\nendpoints/db    10.244.0.39:5432                    103s\nendpoints/web   10.244.0.49:80,10.244.0.50:80       103s","more":0},{"t":25.4,"kind":"run","cmd":"kubectl -n shop rollout status deploy/worker --timeout=90s","out":"deployment \"worker\" successfully rolled out","more":0},{"t":25.4,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=35","out":"2026-11-04T16:08:33.198184386Z 2026-11-04T16:08:33Z GET /orders 000\n2026-11-04T16:08:35.208975550Z 2026-11-04T16:08:35Z GET /orders 000\n2026-11-04T16:08:37.213108900Z 2026-11-04T16:08:37Z GET /orders 000\n2026-11-04T16:08:39.223656498Z 2026-11-04T16:08:39Z GET /orders 200\n2026-11-04T16:08:41.236327600Z 2026-11-04T16:08:41Z GET /orders 200\n2026-11-04T16:08:43.251636920Z 2026-11-04T16:08:43Z GET /orders 200\n2026-11-04T16:08:45.265109381Z 2026-11-04T16:08:45Z GET /orders 200\n2026-11-04T16:08:47.274188505Z 2026-11-04T16:08:47Z GET /orders 200\n2026-11-04T16:08:49.282185985Z 2026-11-04T16:08:49Z GET /orders 200\n2026-11-04T16:08:55.293156967Z 2026-11-04T16:08:55Z GET /orders 000\n2026-11-04T16:08:59.311488721Z 2026-11-04T16:08:59Z GET /orders 504\n2026-11-04T16:09:03.339131045Z 2026-11-04T16:09:03Z GET /orders 504\n2026-11-04T16:09:07.352718509Z 2026-11-04T16:09:07Z GET /orders 504\n2026-11-04T16:09:11.361365602Z 2026-11-04T16:09:11Z GET /orders 504\n2026-11-04T16:09:15.371999751Z 2026-11-04T16:09:15Z GET /orders 504\n2026-11-04T16:09:19.378200199Z 2026-11-04T16:09:19Z GET /orders 504\n2026-11-04T16:09:23.392500834Z 2026-11-04T16:09:23Z GET /orders 504\n2026-11-04T16:09:27.404427910Z 2026-11-04T16:09:27Z GET /orders 504\n2026-11-04T16:09:31.419723970Z 2026-11-04T16:09:31Z GET /orders 504\n2026-11-04T16:09:35.439044145Z 2026-11-04T16:09:35Z GET /orders 504\n2026-11-04T16:09:39.458537865Z 2026-11-04T16:09:39Z GET /orders 504\n2026-11-04T16:09:43.484193340Z 2026-11-04T16:09:43Z GET /orders 504\n2026-11-04T16:09:47.492016016Z 2026-11-04T16:09:47Z GET /orders 504\n2026-11-04T16:09:51.502254463Z 2026-11-04T16:09:51Z GET /orders 504\n2026-11-04T16:09:55.513039417Z 2026-11-04T16:09:55Z GET /orders 504\n2026-11-04T16:09:59.528242157Z 2026-11-04T16:09:59Z GET /orders 504\n2026-11-04T16:10:03.543364357Z 2026-11-04T16:10:03Z GET /orders 504\n2026-11-04T16:10:05.554002799Z 2026-11-04T16:10:05Z GET /orders 200\n2026-11-04T16:10:07.583034453Z 2026-11-04T16:10:07Z GET /orders 200\n2026-11-04T16:10:09.605471381Z 2026-11-04T16:10:09Z GET /orders 200\n2026-11-04T16:10:11.623504850Z 2026-11-04T16:10:11Z GET /orders 200\n2026-11-04T16:10:13.628541796Z 2026-11-04T16:10:13Z GET /orders 200","more":0},{"t":28.2,"kind":"run","cmd":"kubectl -n shop get deploy web worker -o wide","out":"NAME     READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS   IMAGES               SELECTOR\nweb      2/2     2            2           106s   nginx        nginx:1.29-alpine    app=web\nworker   1/1     1            1           106s   worker       python:3.13-alpine   app=worker","more":0},{"t":28.2,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=15","out":"2026-11-04T16:09:31.419723970Z 2026-11-04T16:09:31Z GET /orders 504\n2026-11-04T16:09:35.439044145Z 2026-11-04T16:09:35Z GET /orders 504\n2026-11-04T16:09:39.458537865Z 2026-11-04T16:09:39Z GET /orders 504\n2026-11-04T16:09:43.484193340Z 2026-11-04T16:09:43Z GET /orders 504\n2026-11-04T16:09:47.492016016Z 2026-11-04T16:09:47Z GET /orders 504\n2026-11-04T16:09:51.502254463Z 2026-11-04T16:09:51Z GET /orders 504\n2026-11-04T16:09:55.513039417Z 2026-11-04T16:09:55Z GET /orders 504\n2026-11-04T16:09:59.528242157Z 2026-11-04T16:09:59Z GET /orders 504\n2026-11-04T16:10:03.543364357Z 2026-11-04T16:10:03Z GET /orders 504\n2026-11-04T16:10:05.554002799Z 2026-11-04T16:10:05Z GET /orders 200\n2026-11-04T16:10:07.583034453Z 2026-11-04T16:10:07Z GET /orders 200\n2026-11-04T16:10:09.605471381Z 2026-11-04T16:10:09Z GET /orders 200\n2026-11-04T16:10:11.623504850Z 2026-11-04T16:10:11Z GET /orders 200\n2026-11-04T16:10:13.628541796Z 2026-11-04T16:10:13Z GET /orders 200\n2026-11-04T16:10:15.646985332Z 2026-11-04T16:10:15Z GET /orders 200","more":0},{"t":28.2,"kind":"run","cmd":"kubectl -n shop logs deploy/worker --timestamps --tail=30","out":"2026-11-04T16:10:11.935137014Z worker started, batch buffer 230 MiB\n2026-11-04T16:10:12.002155140Z processed batch\n2026-11-04T16:10:17.073691568Z processed batch","more":0}],"report":"IMPACT: `/orders` requests timed out or returned 504 from 16:08:55 UTC until recovery began at 16:10:05 UTC on November 4. The worker was also OOM-killed after its 16:08:48 rollout, interrupting batch processing.\n\nROOT CAUSE: `ConfigMap/shop/web-nginx-v3`, field `data.default.conf`, routed orders to unreachable `10.96.200.200:8080` instead of the API Service. Separately, `Deployment/shop/worker` configured a 230 MiB batch buffer with a 192 MiB memory limit.\n\nACTIONS TAKEN:\n1. Rolled back `Deployment/shop/web` to the prior configuration.\n2. Raised the worker memory limit from 192 MiB to 320 MiB.\n\nSTATUS: Mitigated. Web is 2/2 ready, and synthetic probes returned consecutive 200s from 16:10:05 through 16:10:15 UTC. Worker is 1/1 ready and logged two processed batches. Sustained recovery over the alert’s five-minute window has not yet been verified.\n\nESCALATION: none.\n\nFOLLOW-UP: Update the web release configuration and add an end-to-end `/orders` rollout check so an incorrect upstream cannot pass on `/healthz` alone."}