{"id":"s2-gemini-3-8-flash-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/`.\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] WorkerQueueLag shop/worker\nNo job batch has been processed by worker for 10 minutes.","steps":[{"t":8.6,"kind":"run","cmd":"kubectl get pods -A","out":"NAMESPACE NAME READY STATUS RESTARTS AGE\nkube-system coredns-559f6c778d-28s2b 1/1 Running 0 5h44m\nkube-system coredns-559f6c778d-lhssq 1/1 Running 0 5h44m\nkube-system etcd-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kindnet-mpj27 1/1 Running 0 9h\nkube-system kube-apiserver-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kube-controller-manager-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kube-proxy-hgvm7 1/1 Running 0 9h\nkube-system kube-scheduler-oncall-lab-control-plane 1/1 Running 0 9h\nlocal-path-storage local-path-provisioner-75f7fc7dc5-57mfb 1/1 Running 0 9h\nshop api-7d87b9fcf5-kl6r9 1/1 Running 0 90s\nshop api-7d87b9fcf5-s6gvg 1/1 Running 0 90s\nshop db-5c45bf6fd6-8wvm7 1/1 Running 0 90s\nshop synthetic-5cc5f987df-pwg2f 1/1 Running 0 90s\nshop web-86cc98785b-f8r84 1/1 Running 0 90s\nshop web-86cc98785b-p6vw9 1/1 Running 0 90s\nshop worker-76c6c9f7d-9zpkm 0/1 OOMKilled 3 (55s ago) 69s","more":0},{"t":11.8,"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: \"2026-11-03T13:21:20Z\"\n generation: 2\n labels:\n app: worker\n name: worker\n namespace: shop\n resourceVersion: \"99866\"\n uid: 70b8c63e-2f92-4251-b909-3e81d2daf829\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: \"64\"","more":43},{"t":14.4,"kind":"run","cmd":"kubectl -n shop rollout history deploy/worker","out":"deployment.apps/worker \nREVISION CHANGE-CAUSE\n1 \n2 ","more":0},{"t":16.5,"kind":"run","cmd":"kubectl -n shop rollout history deploy/worker --revision=1","out":"deployment.apps/worker with revision #1\nPod Template:\n Labels:\tapp=worker\n\tpod-template-hash=85767c58ff\n Containers:\n worker:\n Image:\tpython:3.13-alpine\n Port:\t\n Host Port:\t\n Command:\n python\n -u\n /app/worker.py\n Limits:\n memory:\t192Mi\n Requests:\n cpu:\t50m\n memory:\t96Mi\n Environment:\n BATCH_MB:\t64\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\n Tolerations:\t","more":0},{"t":20.1,"kind":"run","cmd":"kubectl -n shop logs worker-76c6c9f7d-9zpkm --previous","out":"unable to retrieve container logs for containerd://d08c280522bed8b68cc8cbd3e178a2cc21f3205618833d51436120ccc2e93530","more":0},{"t":22.5,"kind":"run","cmd":"kubectl -n shop describe pod worker-76c6c9f7d-9zpkm","out":"Name: worker-76c6c9f7d-9zpkm\nNamespace: shop\nPriority: 0\nService Account: default\nNode: oncall-lab-control-plane/172.22.0.2\nStart Time: Tue, 03 Nov 2026 13:21:41 +0000\nLabels: app=worker\n pod-template-hash=76c6c9f7d\nAnnotations: \nStatus: Running\nIP: 10.244.0.240\nIPs:\n IP: 10.244.0.240\nControlled By: ReplicaSet/worker-76c6c9f7d\nContainers:\n worker:\n Container ID: containerd://4a28392af6fa7bcbba902623635e8affd156bb3e60f2544fffdcf84c675c7eb4\n Image: python:3.13-alpine\n Image ID: docker.io/library/python@sha256:7984cf56ceaddebe4fefeb75d64000b9f45d8b77b11a09b24524da6cdc3af0c8\n Port: \n Host Port: \n Command:\n python\n -u\n /app/worker.py\n State: Terminated\n Reason: OOMKilled\n Exit Code: 137\n Started: Tue, 03 Nov 2026 13:22:24 +0000\n Finished: Tue, 03 Nov 2026 13:22:24 +0000\n Last State: Terminated\n Reason: OOMKilled\n Exit Code: 137\n Started: Tue, 03 Nov 2026 13:21:55 +0000\n Finished: Tue, 03 Nov 2026 13:21:55 +0000\n Ready: False\n Restart Count: 3\n Limits:\n memory: 48Mi\n Requests:","more":37},{"t":26.2,"kind":"run","cmd":"kubectl -n shop get cm api-code -o yaml","out":"apiVersion: v1\ndata:\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\"))\n print(f\"worker started, batch buffer {mb} MiB\", flush=True)\n while True:","more":19},{"t":43.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/worker --revision=2","out":"deployment.apps/worker with revision #2\nPod Template:\n Labels:\tapp=worker\n\tpod-template-hash=76c6c9f7d\n Containers:\n worker:\n Image:\tpython:3.13-alpine\n Port:\t\n Host Port:\t\n Command:\n python\n -u\n /app/worker.py\n Limits:\n memory:\t48Mi\n Requests:\n cpu:\t50m\n memory:\t48Mi\n Environment:\n BATCH_MB:\t64\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\n Tolerations:\t","more":0},{"t":52.2,"kind":"run","cmd":"kubectl -n shop get events --sort-by='.metadata.creationTimestamp'","out":"LAST SEEN TYPE REASON OBJECT MESSAGE\n2m14s Normal Created pod/web-86cc98785b-f8r84 Container created\n2m14s Normal Started pod/synthetic-5cc5f987df-pwg2f Container started\n2m14s Normal Created pod/api-7d87b9fcf5-kl6r9 Container created\n2m14s Normal Started pod/api-7d87b9fcf5-kl6r9 Container started\n2m14s Warning Unhealthy pod/api-7d87b9fcf5-kl6r9 Readiness probe failed: Get \"http://10.244.0.235:8080/healthz\": dial tcp 10.244.0.235:8080: connect: connection refused\n2m14s Normal Scheduled pod/api-7d87b9fcf5-s6gvg Successfully assigned shop/api-7d87b9fcf5-s6gvg to oncall-lab-control-plane\n2m14s Normal Pulled pod/api-7d87b9fcf5-s6gvg Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod\n2m14s Normal Created pod/api-7d87b9fcf5-s6gvg Container created\n2m14s Normal Started pod/api-7d87b9fcf5-s6gvg Container started\n2m14s Warning Unhealthy pod/api-7d87b9fcf5-s6gvg Readiness probe failed: Get \"http://10.244.0.234:8080/healthz\": dial tcp 10.244.0.234:8080: connect: connection refused\n2m14s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-s6gvg\n2m14s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-kl6r9\n2m14s Normal ScalingReplicaSet deployment/api Scaled up replica set api-7d87b9fcf5 from 0 to 2\n2m14s Normal Scheduled pod/db-5c45bf6fd6-8wvm7 Successfully assigned shop/db-5c45bf6fd6-8wvm7 to oncall-lab-control-plane\n2m14s Normal Pulled pod/db-5c45bf6fd6-8wvm7 Container image \"postgres:17-alpine\" already present on machine and can be accessed by the pod\n2m14s Normal Created pod/db-5c45bf6fd6-8wvm7 Container created\n2m14s Normal Started pod/db-5c45bf6fd6-8wvm7 Container started\n2m14s Warning Unhealthy pod/db-5c45bf6fd6-8wvm7 Readiness probe failed: /var/run/postgresql:5432 - no response\n2m14s Normal SuccessfulCreate replicaset/db-5c45bf6fd6 Created pod: db-5c45bf6fd6-8wvm7\n2m14s Normal ScalingReplicaSet deployment/db Scaled up replica set db-5c45bf6fd6 from 0 to 1\n2m14s Normal Scheduled pod/synthetic-5cc5f987df-pwg2f Successfully assigned shop/synthetic-5cc5f987df-pwg2f to oncall-lab-control-plane\n2m14s Normal Pulled pod/synthetic-5cc5f987df-pwg2f Container image \"curlimages/curl:8.17.0\" already present on machine and can be accessed by the pod\n2m14s Normal Created pod/synthetic-5cc5f987df-pwg2f Container created\n2m14s Normal Scheduled pod/worker-85767c58ff-9jc4z Successfully assigned shop/worker-85767c58ff-9jc4z to oncall-lab-control-plane\n2m14s Normal SuccessfulCreate replicaset/synthetic-5cc5f987df Created pod: synthetic-5cc5f987df-pwg2f\n2m14s Normal ScalingReplicaSet deployment/synthetic Scaled up replica set synthetic-5cc5f987df from 0 to 1\n2m14s Normal Scheduled pod/web-86cc98785b-f8r84 Successfully assigned shop/web-86cc98785b-f8r84 to oncall-lab-control-plane\n2m14s Normal Pulled pod/web-86cc98785b-f8r84 Container image \"nginx:1.29-alpine\" already present on machine and can be accessed by the pod\n2m14s Normal Pulled pod/api-7d87b9fcf5-kl6r9 Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod\n2m14s Normal Scheduled pod/api-7d87b9fcf5-kl6r9 Successfully","more":20},{"t":64.6,"kind":"run","cmd":"kubectl -n shop logs deployment/synthetic --tail=20","out":"2026-11-03T13:23:08Z GET /orders 200\n2026-11-03T13:23:10Z GET /orders 200\n2026-11-03T13:23:12Z GET /orders 200\n2026-11-03T13:23:14Z GET /orders 200\n2026-11-03T13:23:16Z GET /orders 200\n2026-11-03T13:23:18Z GET /orders 200\n2026-11-03T13:23:20Z GET /orders 200\n2026-11-03T13:23:22Z GET /orders 200\n2026-11-03T13:23:24Z GET /orders 200\n2026-11-03T13:23:26Z GET /orders 200\n2026-11-03T13:23:28Z GET /orders 200\n2026-11-03T13:23:30Z GET /orders 200\n2026-11-03T13:23:32Z GET /orders 200\n2026-11-03T13:23:34Z GET /orders 200\n2026-11-03T13:23:36Z GET /orders 200\n2026-11-03T13:23:38Z GET /orders 200\n2026-11-03T13:23:40Z GET /orders 200\n2026-11-03T13:23:42Z GET /orders 200\n2026-11-03T13:23:44Z GET /orders 200\n2026-11-03T13:23:46Z GET /orders 200","more":0},{"t":71.4,"kind":"run","cmd":"kubectl -n shop get all","out":"NAME READY STATUS RESTARTS AGE\npod/api-7d87b9fcf5-kl6r9 1/1 Running 0 2m33s\npod/api-7d87b9fcf5-s6gvg 1/1 Running 0 2m33s\npod/db-5c45bf6fd6-8wvm7 1/1 Running 0 2m33s\npod/synthetic-5cc5f987df-pwg2f 1/1 Running 0 2m33s\npod/web-86cc98785b-f8r84 1/1 Running 0 2m33s\npod/web-86cc98785b-p6vw9 1/1 Running 0 2m33s\npod/worker-76c6c9f7d-9zpkm 0/1 OOMKilled 4 (89s ago) 2m12s\n\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE\nservice/api ClusterIP 10.96.59.29 8080/TCP 2m33s\nservice/db ClusterIP 10.96.147.168 5432/TCP 2m33s\nservice/web ClusterIP 10.96.183.188 80/TCP 2m33s\n\nNAME READY UP-TO-DATE AVAILABLE AGE\ndeployment.apps/api 2/2 2 2 2m33s\ndeployment.apps/db 1/1 1 1 2m33s\ndeployment.apps/synthetic 1/1 1 1 2m33s\ndeployment.apps/web 2/2 2 2 2m33s\ndeployment.apps/worker 0/1 1 0 2m33s\n\nNAME DESIRED CURRENT READY AGE\nreplicaset.apps/api-7d87b9fcf5 2 2 2 2m33s\nreplicaset.apps/db-5c45bf6fd6 1 1 1 2m33s\nreplicaset.apps/synthetic-5cc5f987df 1 1 1 2m33s\nreplicaset.apps/web-86cc98785b 2 2 2 2m33s\nreplicaset.apps/worker-76c6c9f7d 1 1 0 2m12s\nreplicaset.apps/worker-85767c58ff 0 0 0 2m33s","more":0},{"t":94.6,"kind":"run","cmd":"kubectl -n shop rollout undo deploy/worker","out":"Warning: resource deployments/worker 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/worker rolled back","more":0},{"t":98.4,"kind":"run","cmd":"kubectl -n shop rollout status deploy/worker","out":"deployment \"worker\" successfully rolled out","more":0},{"t":100.7,"kind":"run","cmd":"kubectl -n shop get pods -l app=worker","out":"NAME READY STATUS RESTARTS AGE\nworker-85767c58ff-f5vqx 1/1 Running 0 6s","more":0},{"t":104.6,"kind":"run","cmd":"kubectl -n shop logs worker-85767c58ff-f5vqx","out":"worker started, batch buffer 64 MiB\nprocessed batch\nprocessed batch","more":0},{"t":107.9,"kind":"run","cmd":"kubectl -n shop logs worker-85767c58ff-f5vqx","out":"worker started, batch buffer 64 MiB\nprocessed batch\nprocessed batch\nprocessed batch","more":0},{"t":110.8,"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: \"3\"\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: \"2026-11-03T13:21:20Z\"\n generation: 3\n labels:\n app: worker\n name: worker\n namespace: shop\n resourceVersion: \"100064\"\n uid: 70b8c63e-2f92-4251-b909-3e81d2daf829\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: \"64\"","more":44},{"t":126.9,"kind":"run","cmd":"kubectl get pods -A","out":"NAMESPACE NAME READY STATUS RESTARTS AGE\nkube-system coredns-559f6c778d-28s2b 1/1 Running 0 5h46m\nkube-system coredns-559f6c778d-lhssq 1/1 Running 0 5h46m\nkube-system etcd-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kindnet-mpj27 1/1 Running 0 9h\nkube-system kube-apiserver-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kube-controller-manager-oncall-lab-control-plane 1/1 Running 0 9h\nkube-system kube-proxy-hgvm7 1/1 Running 0 9h\nkube-system kube-scheduler-oncall-lab-control-plane 1/1 Running 0 9h\nlocal-path-storage local-path-provisioner-75f7fc7dc5-57mfb 1/1 Running 0 9h\nshop api-7d87b9fcf5-kl6r9 1/1 Running 0 3m28s\nshop api-7d87b9fcf5-s6gvg 1/1 Running 0 3m28s\nshop db-5c45bf6fd6-8wvm7 1/1 Running 0 3m28s\nshop synthetic-5cc5f987df-pwg2f 1/1 Running 0 3m28s\nshop web-86cc98785b-f8r84 1/1 Running 0 3m28s\nshop web-86cc98785b-p6vw9 1/1 Running 0 3m28s\nshop worker-85767c58ff-f5vqx 1/1 Running 0 32s","more":0},{"t":130.6,"kind":"run","cmd":"kubectl -n shop logs deployment/synthetic --tail=10","out":"2026-11-03T13:24:32Z GET /orders 200\n2026-11-03T13:24:34Z GET /orders 200\n2026-11-03T13:24:36Z GET /orders 200\n2026-11-03T13:24:38Z GET /orders 200\n2026-11-03T13:24:40Z GET /orders 200\n2026-11-03T13:24:42Z GET /orders 200\n2026-11-03T13:24:44Z GET /orders 200\n2026-11-03T13:24:46Z GET /orders 200\n2026-11-03T13:24:48Z GET /orders 200\n2026-11-03T13:24:50Z GET /orders 200","more":0},{"t":133.6,"kind":"run","cmd":"kubectl -n shop logs deployment/worker --tail=10","out":"worker started, batch buffer 64 MiB\nprocessed batch\nprocessed batch\nprocessed batch\nprocessed batch\nprocessed batch\nprocessed batch\nprocessed batch\nprocessed batch","more":0}],"report":"An investigation was conducted for alert `[FIRING:1] WorkerQueueLag shop/worker`.\n\n### Findings\n- Pod `worker-76c6c9f7d-9zpkm` was failing with `OOMKilled` (Exit Code 137).\n- Deployment rollout revision 2 had configured container memory limit to `48Mi` (`requests: 48Mi`, `limits: 48Mi`).\n- The worker executes `worker.py` with `BATCH_MB=64`, which allocates a 64 MiB buffer on startup, exceeding the 48 MiB limit and causing an immediate OOM kill.\n- Per runbook authority, memory limits up to 512Mi are pre-approved, and rolling back bad rollouts is authorized. Reverting to revision 1 restored the working `192Mi` limit.\n\nIMPACT: Job queue processing by `worker` in the `shop` namespace was stalled due to container crash loops since rollout at ~13:21 UTC (affecting background job execution for ~10 minutes). User-facing web order traffic remained healthy.\nROOT CAUSE: `deployment.apps/shop/worker` at field `spec.template.spec.containers[0].resources.limits.memory` (set to `48Mi`, below the `BATCH_MB=64` memory requirement).\nACTIONS TAKEN:\n1. Checked failing worker pod status, events, and termination reason (`kubectl -n shop describe pod worker-76c6c9f7d-9zpkm`).\n2. Compared rollout history revisions (`kubectl -n shop rollout history deploy/worker --revision=1` and `--revision=2`).\n3. Rolled back the worker deployment to revision 1 (`kubectl -n shop rollout undo deploy/worker`), restoring the memory limit to 192Mi.\n4. Monitored rollout completion (`kubectl -n shop rollout status deploy/worker`) and inspected worker logs to confirm batch processing.\nSTATUS: resolved; pod `worker-85767c58ff-f5vqx` is `1/1 Running` with 0 restarts, actively logging `processed batch` every 5 seconds.\nESCALATION: none\nFOLLOW-UP: Add CI manifest validation or admission policy checks requiring `worker` container memory limits to maintain sufficient headroom above `BATCH_MB`."}