{"id":"s8-gpt-6-1-terra-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":5.2,"kind":"say","text":"I’ll establish when the failures began, compare that with recent rollouts, and check the request path before making any changes."},{"t":5.3,"kind":"run","cmd":"kubectl -n shop rollout history deployment/web","out":"deployment.apps/web \nREVISION CHANGE-CAUSE\n1 \n2 release 2026.11.3: edge routing for orders-v2","more":0},{"t":5.3,"kind":"run","cmd":"kubectl -n shop rollout history deployment/api","out":"deployment.apps/api \nREVISION CHANGE-CAUSE\n1 ","more":0},{"t":5.3,"kind":"run","cmd":"kubectl -n shop rollout history deployment/db","out":"deployment.apps/db \nREVISION CHANGE-CAUSE\n1 ","more":0},{"t":5.3,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=200","out":"2026-11-04T18:07:30.030718678Z 2026-11-04T18:07:30Z GET /orders 000\n2026-11-04T18:07:32.041860146Z 2026-11-04T18:07:32Z GET /orders 000\n2026-11-04T18:07:34.046042367Z 2026-11-04T18:07:34Z GET /orders 000\n2026-11-04T18:07:36.053452345Z 2026-11-04T18:07:36Z GET /orders 200\n2026-11-04T18:07:38.058688116Z 2026-11-04T18:07:38Z GET /orders 200\n2026-11-04T18:07:40.076144845Z 2026-11-04T18:07:40Z GET /orders 200\n2026-11-04T18:07:42.092564878Z 2026-11-04T18:07:42Z GET /orders 200\n2026-11-04T18:07:44.097917212Z 2026-11-04T18:07:44Z GET /orders 200\n2026-11-04T18:07:46.104381868Z 2026-11-04T18:07:46Z GET /orders 200\n2026-11-04T18:07:52.112570991Z 2026-11-04T18:07:52Z GET /orders 000\n2026-11-04T18:07:56.120972580Z 2026-11-04T18:07:56Z GET /orders 504\n2026-11-04T18:08:00.130348804Z 2026-11-04T18:08:00Z GET /orders 504\n2026-11-04T18:08:04.143630647Z 2026-11-04T18:08:04Z GET /orders 504\n2026-11-04T18:08:08.166095696Z 2026-11-04T18:08:08Z GET /orders 504\n2026-11-04T18:08:12.179376213Z 2026-11-04T18:08:12Z GET /orders 504\n2026-11-04T18:08:16.193039196Z 2026-11-04T18:08:16Z GET /orders 504\n2026-11-04T18:08:20.199579834Z 2026-11-04T18:08:20Z GET /orders 504\n2026-11-04T18:08:24.215065926Z 2026-11-04T18:08:24Z GET /orders 504\n2026-11-04T18:08:28.226985079Z 2026-11-04T18:08:28Z GET /orders 504\n2026-11-04T18:08:32.234322868Z 2026-11-04T18:08:32Z GET /orders 504\n2026-11-04T18:08:36.247579588Z 2026-11-04T18:08:36Z GET /orders 504\n2026-11-04T18:08:40.265871567Z 2026-11-04T18:08:40Z GET /orders 504\n2026-11-04T18:08:44.283689258Z 2026-11-04T18:08:44Z GET /orders 504\n2026-11-04T18:08:48.300793703Z 2026-11-04T18:08:48Z GET /orders 504","more":0},{"t":5.3,"kind":"run","cmd":"kubectl -n shop get deployments,pods,services,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 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 0/1 1 0 83s worker python:3.13-alpine app=worker\n\nNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES\npod/api-7d87b9fcf5-q67fk 1/1 Running 0 83s 10.244.0.126 oncall-lab-control-plane \npod/api-7d87b9fcf5-qnxjg 1/1 Running 0 83s 10.244.0.127 oncall-lab-control-plane \npod/db-5c45bf6fd6-nzswf 1/1 Running 0 83s 10.244.0.125 oncall-lab-control-plane \npod/synthetic-5cc5f987df-6gxg9 1/1 Running 0 83s 10.244.0.131 oncall-lab-control-plane \npod/web-765c764598-6smzf 1/1 Running 0 65s 10.244.0.133 oncall-lab-control-plane \npod/web-765c764598-7rr8l 1/1 Running 0 65s 10.244.0.134 oncall-lab-control-plane \npod/worker-8d9d856dd-cf27v 0/1 OOMKilled 3 (51s ago) 65s 10.244.0.132 oncall-lab-control-plane \n\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR\nservice/api ClusterIP 10.96.255.198 8080/TCP 83s app=api\nservice/db ClusterIP 10.96.32.241 5432/TCP 83s app=db\nservice/web ClusterIP 10.96.115.156 80/TCP 83s app=web\n\nNAME ENDPOINTS AGE\nendpoints/api 10.244.0.126:8080,10.244.0.127:8080 83s\nendpoints/db 10.244.0.125:5432 83s\nendpoints/web 10.244.0.133:80,10.244.0.134:80 83s","more":0},{"t":8.7,"kind":"say","text":"The sustained failures started around 18:07:52 UTC, immediately after a `web` rollout labeled “edge routing for orders-v2.” The runbook directs a rollback when the timing matches; I’m undoing that rollout. The worker is also OOM-killed, which I’ll investigate separately."},{"t":8.8,"kind":"run","cmd":"kubectl -n shop rollout undo deployment/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":13.2,"kind":"run","cmd":"kubectl -n shop get deployment 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: \"2026-11-04T18:07:28Z\"\n generation: 2\n labels:\n app: worker\n name: worker\n namespace: shop\n resourceVersion: \"313965\"\n uid: 40cf4919-cad7-4dff-b640-de28fa043caf\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":13.2,"kind":"run","cmd":"kubectl -n shop logs pod/worker-8d9d856dd-cf27v --previous --timestamps --tail=100","out":"unable to retrieve container logs for containerd://8e24cc8820c855c7a05068a2fab064e3befa33268135a8829df4a4b4a4858f51","more":0},{"t":13.2,"kind":"run","cmd":"kubectl -n shop rollout history deployment/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\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\n Tolerations:\t","more":0},{"t":13.2,"kind":"run","cmd":"kubectl -n shop describe pod worker-8d9d856dd-cf27v","out":"Name: worker-8d9d856dd-cf27v\nNamespace: shop\nPriority: 0\nService Account: default\nNode: oncall-lab-control-plane/172.22.0.2\nStart Time: Wed, 04 Nov 2026 18:07:46 +0000\nLabels: app=worker\n pod-template-hash=8d9d856dd\nAnnotations: \nStatus: Running\nIP: 10.244.0.132\nIPs:\n IP: 10.244.0.132\nControlled By: ReplicaSet/worker-8d9d856dd\nContainers:\n worker:\n Container ID: containerd://6955d30741e1f5a80121379d2f30f23264fbc7734488a2d5619e6b80d12da348\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: Wed, 04 Nov 2026 18:08:29 +0000\n Finished: Wed, 04 Nov 2026 18:08:30 +0000\n Last State: Terminated\n Reason: OOMKilled\n Exit Code: 137\n Started: Wed, 04 Nov 2026 18:07:59 +0000\n Finished: Wed, 04 Nov 2026 18:08:00 +0000\n Ready: False\n Restart Count: 3\n Limits:\n memory: 192Mi\n Requests:","more":37},{"t":13.2,"kind":"run","cmd":"kubectl -n shop logs deploy/db --timestamps --tail=100","out":"2026-11-04T18:07:28.910139069Z The files belonging to this database system will be owned by user \"postgres\".\n2026-11-04T18:07:28.910152194Z This user must also own the server process.\n2026-11-04T18:07:28.910153028Z \n2026-11-04T18:07:28.910156278Z The database cluster will be initialized with locale \"en_US.utf8\".\n2026-11-04T18:07:28.910252779Z The default database encoding has accordingly been set to \"UTF8\".\n2026-11-04T18:07:28.910254070Z The default text search configuration will be set to \"english\".\n2026-11-04T18:07:28.910254570Z \n2026-11-04T18:07:28.910255070Z Data page checksums are disabled.\n2026-11-04T18:07:28.910255487Z \n2026-11-04T18:07:28.910256029Z fixing permissions on existing directory /var/lib/postgresql/data/pgdata ... ok\n2026-11-04T18:07:28.910380405Z creating subdirectories ... ok\n2026-11-04T18:07:28.910385988Z selecting dynamic shared memory implementation ... posix\n2026-11-04T18:07:28.924182607Z selecting default \"max_connections\" ... 100\n2026-11-04T18:07:28.939234987Z selecting default \"shared_buffers\" ... 128MB\n2026-11-04T18:07:28.964729706Z selecting default time zone ... UTC\n2026-11-04T18:07:28.965054334Z creating configuration files ... ok\n2026-11-04T18:07:29.034939728Z running bootstrap script ... ok\n2026-11-04T18:07:29.112935608Z sh: locale: not found\n2026-11-04T18:07:29.112950150Z 2026-11-04 18:07:29.112 UTC [48] WARNING: no usable system locales were found\n2026-11-04T18:07:29.270772634Z performing post-bootstrap initialization ... ok\n2026-11-04T18:07:29.273264072Z syncing data to disk ... ok\n2026-11-04T18:07:29.273279030Z \n2026-11-04T18:07:29.273279780Z \n2026-11-04T18:07:29.273280655Z Success. You can now start the database server using:\n2026-11-04T18:07:29.273281030Z \n2026-11-04T18:07:29.273281489Z pg_ctl -D /var/lib/postgresql/data/pgdata -l logfile start\n2026-11-04T18:07:29.273281864Z \n2026-11-04T18:07:29.273274030Z initdb: warning: enabling \"trust\" authentication for local connections\n2026-11-04T18:07:29.273284530Z 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.\n2026-11-04T18:07:29.293111326Z waiting for server to start....2026-11-04 18:07:29.293 UTC [54] LOG: starting PostgreSQL 17.11 on aarch64-unknown-linux-musl, compiled by gcc (Alpine 15.2.0) 15.2.0, 64-bit\n2026-11-04T18:07:29.294169544Z 2026-11-04 18:07:29.294 UTC [54] LOG: listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n2026-11-04T18:07:29.295054634Z 2026-11-04 18:07:29.294 UTC [57] LOG: database system was shut down at 2026-11-04 18:07:29 UTC\n2026-11-04T18:07:29.296779733Z 2026-11-04 18:07:29.296 UTC [54] LOG: database system is ready to accept connections\n2026-11-04T18:07:29.385543414Z done\n2026-11-04T18:07:29.385558747Z server started\n2026-11-04T18:07:29.392908602Z \n2026-11-04T18:07:29.392915561Z /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*\n2026-11-04T18:07:29.392916561Z \n2026-11-04T18:07:29.393306606Z waiting for server to shut down....2026-11-04 18:07:29.393 UTC [54] LOG: received fast shutdown request\n2026-11-04T18:07:29.393321772Z 2026-11-04 18:07:29.393 UTC [54] LOG: aborting any active transactions","more":16},{"t":13.2,"kind":"run","cmd":"kubectl -n shop rollout status deployment/web --timeout=60s","out":"deployment \"web\" successfully rolled out","more":0},{"t":13.2,"kind":"run","cmd":"kubectl -n shop logs deploy/web --all-pods=true --timestamps --tail=100","out":"[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.527009173Z /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.527019590Z /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.527382301Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.528065848Z 10-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.528126724Z /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.528185183Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.529482860Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.530429909Z /docker-entrypoint.sh: Configuration complete; ready for start up\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534592402Z 2026/11/04 18:08:55 [notice] 1#1: using the \"epoll\" event method\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534603943Z 2026/11/04 18:08:55 [notice] 1#1: nginx/1.29.8\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534605443Z 2026/11/04 18:08:55 [notice] 1#1: built by gcc 15.2.0 (Alpine 15.2.0) \n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534605985Z 2026/11/04 18:08:55 [notice] 1#1: OS: Linux 6.8.0-117-generic\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534607068Z 2026/11/04 18:08:55 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1073741816:1073741816\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534610360Z 2026/11/04 18:08:55 [notice] 1#1: start worker processes\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534696278Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 28\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534739153Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 29\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534843695Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 30\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534925238Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 31\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.534985447Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 32\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.535061489Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 33\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.535190532Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 34\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.535247157Z 2026/11/04 18:08:55 [notice] 1#1: start worker process 35\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:55.937578494Z 10.244.0.1 - - [04/Nov/2026:18:08:55 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-j6ldr/nginx] 2026-11-04T18:08:58.336411124Z 10.244.0.131 - - [04/Nov/2026:18:08:58 +0000] \"GET /orders HTTP/1.1\" 200 36 \"-\" \"curl/8.17.0\" \"-\"\n[pod/web-86cc98785b-668qr/nginx] 2026-11-04T18:08:56.367763516Z /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration\n[pod/web-86cc98785b-668qr/nginx] 2026-11-04T18:08:56.367778308Z /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/\n[pod/web-86cc98785b-668qr/nginx] 2026-11-04T18:08:56.368220520Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh\n[pod/web-86cc98785b-668qr/nginx] 2026-11-04T18:08:56.369079110Z 10-listen-on-ipv6-by-default.sh: info: can not modify /etc/nginx/conf.d/default.conf (read-only file system?)\n[pod/web-86cc98785b-668qr/nginx] 2026-11-04T18:08:56.369103985Z /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15","more":7},{"t":13.2,"kind":"run","cmd":"kubectl -n shop logs deploy/api --all-pods=true --timestamps --tail=100","out":"[pod/api-7d87b9fcf5-q67fk/api] 2026-11-04T18:07:29.167551245Z api listening on 8080, db=db:5432\n[pod/api-7d87b9fcf5-qnxjg/api] 2026-11-04T18:07:29.188857720Z api listening on 8080, db=db:5432","more":0},{"t":17.1,"kind":"run","cmd":"kubectl -n shop get configmap web-nginx-v3 -o yaml","out":"apiVersion: v1\ndata:\n default.conf: server { listen 80; location /healthz { proxy_pass http://api:8080;\n } location / { proxy_pass http://10.96.200.200:8080; proxy_connect_timeout 2s;\n } }\nkind: ConfigMap\nmetadata:\n creationTimestamp: \"2026-11-04T18:07:46Z\"\n name: web-nginx-v3\n namespace: shop\n resourceVersion: \"313759\"\n uid: 8edaac45-3f54-465a-83fa-93f9a1ad5119","more":0},{"t":17.1,"kind":"run","cmd":"kubectl -n shop get configmap 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":17.1,"kind":"run","cmd":"kubectl -n shop logs pod/worker-8d9d856dd-cf27v --timestamps --tail=100","out":"2026-11-04T18:08:30.081602745Z worker started, batch buffer 230 MiB","more":0},{"t":17.1,"kind":"run","cmd":"kubectl -n shop rollout history deployment/worker","out":"deployment.apps/worker \nREVISION CHANGE-CAUSE\n1 \n2 ","more":0},{"t":17.1,"kind":"run","cmd":"kubectl -n shop rollout history deployment/web --revision=3","out":"deployment.apps/web with revision #3\nPod Template:\n Labels:\tapp=web\n\tpod-template-hash=86cc98785b\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\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\n Optional:\tfalse\n Node-Selectors:\t\n Tolerations:\t","more":0},{"t":17.1,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=35","out":"2026-11-04T18:07:30.030718678Z 2026-11-04T18:07:30Z GET /orders 000\n2026-11-04T18:07:32.041860146Z 2026-11-04T18:07:32Z GET /orders 000\n2026-11-04T18:07:34.046042367Z 2026-11-04T18:07:34Z GET /orders 000\n2026-11-04T18:07:36.053452345Z 2026-11-04T18:07:36Z GET /orders 200\n2026-11-04T18:07:38.058688116Z 2026-11-04T18:07:38Z GET /orders 200\n2026-11-04T18:07:40.076144845Z 2026-11-04T18:07:40Z GET /orders 200\n2026-11-04T18:07:42.092564878Z 2026-11-04T18:07:42Z GET /orders 200\n2026-11-04T18:07:44.097917212Z 2026-11-04T18:07:44Z GET /orders 200\n2026-11-04T18:07:46.104381868Z 2026-11-04T18:07:46Z GET /orders 200\n2026-11-04T18:07:52.112570991Z 2026-11-04T18:07:52Z GET /orders 000\n2026-11-04T18:07:56.120972580Z 2026-11-04T18:07:56Z GET /orders 504\n2026-11-04T18:08:00.130348804Z 2026-11-04T18:08:00Z GET /orders 504\n2026-11-04T18:08:04.143630647Z 2026-11-04T18:08:04Z GET /orders 504\n2026-11-04T18:08:08.166095696Z 2026-11-04T18:08:08Z GET /orders 504\n2026-11-04T18:08:12.179376213Z 2026-11-04T18:08:12Z GET /orders 504\n2026-11-04T18:08:16.193039196Z 2026-11-04T18:08:16Z GET /orders 504\n2026-11-04T18:08:20.199579834Z 2026-11-04T18:08:20Z GET /orders 504\n2026-11-04T18:08:24.215065926Z 2026-11-04T18:08:24Z GET /orders 504\n2026-11-04T18:08:28.226985079Z 2026-11-04T18:08:28Z GET /orders 504\n2026-11-04T18:08:32.234322868Z 2026-11-04T18:08:32Z GET /orders 504\n2026-11-04T18:08:36.247579588Z 2026-11-04T18:08:36Z GET /orders 504\n2026-11-04T18:08:40.265871567Z 2026-11-04T18:08:40Z GET /orders 504\n2026-11-04T18:08:44.283689258Z 2026-11-04T18:08:44Z GET /orders 504\n2026-11-04T18:08:48.300793703Z 2026-11-04T18:08:48Z GET /orders 504\n2026-11-04T18:08:52.317700406Z 2026-11-04T18:08:52Z GET /orders 504\n2026-11-04T18:08:56.328163108Z 2026-11-04T18:08:56Z GET /orders 504\n2026-11-04T18:08:58.337285089Z 2026-11-04T18:08:58Z GET /orders 200\n2026-11-04T18:09:00.349167241Z 2026-11-04T18:09:00Z GET /orders 200\n2026-11-04T18:09:02.360894916Z 2026-11-04T18:09:02Z GET /orders 200","more":0},{"t":17.2,"kind":"run","cmd":"kubectl -n shop get events --sort-by=.lastTimestamp","out":"LAST SEEN TYPE REASON OBJECT MESSAGE\n95s Normal Pulled pod/web-86cc98785b-f5pgd Container image \"nginx:1.29-alpine\" already present on machine and can be accessed by the pod\n95s Normal Scheduled pod/worker-85767c58ff-sl88h Successfully assigned shop/worker-85767c58ff-sl88h to oncall-lab-control-plane\n95s Normal Created pod/api-7d87b9fcf5-q67fk Container created\n95s Normal Started pod/api-7d87b9fcf5-q67fk Container started\n95s Warning Unhealthy pod/api-7d87b9fcf5-q67fk Readiness probe failed: Get \"http://10.244.0.126:8080/healthz\": dial tcp 10.244.0.126:8080: connect: connection refused\n95s Normal Scheduled pod/api-7d87b9fcf5-qnxjg Successfully assigned shop/api-7d87b9fcf5-qnxjg to oncall-lab-control-plane\n95s Normal Pulled pod/api-7d87b9fcf5-qnxjg Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod\n95s Normal Created pod/api-7d87b9fcf5-qnxjg Container created\n95s Normal Started pod/api-7d87b9fcf5-qnxjg Container started\n95s Warning Unhealthy pod/api-7d87b9fcf5-qnxjg Readiness probe failed: Get \"http://10.244.0.127:8080/healthz\": dial tcp 10.244.0.127:8080: connect: connection refused\n95s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-q67fk\n95s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-qnxjg\n95s Normal ScalingReplicaSet deployment/api Scaled up replica set api-7d87b9fcf5 from 0 to 2\n95s Normal Scheduled pod/db-5c45bf6fd6-nzswf Successfully assigned shop/db-5c45bf6fd6-nzswf to oncall-lab-control-plane\n95s Normal Pulled pod/db-5c45bf6fd6-nzswf Container image \"postgres:17-alpine\" already present on machine and can be accessed by the pod\n95s Normal Created pod/db-5c45bf6fd6-nzswf Container created\n95s Normal Started pod/db-5c45bf6fd6-nzswf Container started\n95s Warning Unhealthy pod/db-5c45bf6fd6-nzswf Readiness probe failed: /var/run/postgresql:5432 - no response\n95s Normal SuccessfulCreate replicaset/db-5c45bf6fd6 Created pod: db-5c45bf6fd6-nzswf\n95s Normal ScalingReplicaSet deployment/db Scaled up replica set db-5c45bf6fd6 from 0 to 1\n95s Normal Scheduled pod/synthetic-5cc5f987df-6gxg9 Successfully assigned shop/synthetic-5cc5f987df-6gxg9 to oncall-lab-control-plane\n95s Normal Pulled pod/synthetic-5cc5f987df-6gxg9 Container image \"curlimages/curl:8.17.0\" already present on machine and can be accessed by the pod\n95s Normal Created pod/synthetic-5cc5f987df-6gxg9 Container created\n95s Normal ScalingReplicaSet deployment/worker Scaled up replica set worker-85767c58ff from 0 to 1\n95s Normal SuccessfulCreate replicaset/synthetic-5cc5f987df Created pod: synthetic-5cc5f987df-6gxg9\n95s Normal ScalingReplicaSet deployment/synthetic Scaled up replica set synthetic-5cc5f987df from 0 to 1\n95s Normal SuccessfulCreate replicaset/worker-85767c58ff Created pod: worker-85767c58ff-sl88h\n95s Normal Started pod/worker-85767c58ff-sl88h Container started\n95s Normal Created pod/worker-85767c58ff-sl88h Container created\n95s Normal Pulled pod/worker-85767c58ff-sl88h Container image \"python:3.13-alpine\" already present on machine and can be accessed by the pod","more":58},{"t":21.3,"kind":"say","text":"The rollback restored HTTP 200 responses. The faulty nginx configuration sent orders to `10.96.200.200` rather than the API service, while its health check used the correct upstream. Separately, the worker allocates a 230 MiB buffer under a 192 MiB limit; I’ll raise that limit within the runbook’s 512 MiB ceiling."},{"t":21.4,"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":25.1,"kind":"run","cmd":"kubectl -n shop get deployment worker -o jsonpath='{.spec.template.spec.containers[0].resources}'","out":"{\"limits\":{\"memory\":\"320Mi\"},\"requests\":{\"cpu\":\"50m\",\"memory\":\"96Mi\"}}","more":0},{"t":25.1,"kind":"run","cmd":"kubectl -n shop get configmap web-nginx -o yaml","out":"apiVersion: v1\ndata:\n default.conf: |\n server {\n listen 80;\n location / { proxy_pass http://api:8080; proxy_connect_timeout 2s; proxy_read_timeout 3s; }\n }\nkind: ConfigMap\nmetadata:\n annotations:\n kubectl.kubernetes.io/last-applied-configuration: |\n {\"apiVersion\":\"v1\",\"data\":{\"default.conf\":\"server {\\n listen 80;\\n location / { proxy_pass http://api:8080; proxy_connect_timeout 2s; proxy_read_timeout 3s; }\\n}\\n\"},\"kind\":\"ConfigMap\",\"metadata\":{\"annotations\":{},\"name\":\"web-nginx\",\"namespace\":\"shop\"}}\n creationTimestamp: \"2026-11-04T18:07:28Z\"\n name: web-nginx\n namespace: shop\n resourceVersion: \"313599\"\n uid: f561d4e4-1233-42e1-ad32-02a660c29d54","more":0},{"t":25.1,"kind":"run","cmd":"kubectl -n shop rollout status deployment/worker --timeout=60s","out":"deployment \"worker\" successfully rolled out","more":0},{"t":25.1,"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-q67fk 1/1 Running 0 103s 10.244.0.126 oncall-lab-control-plane \npod/api-7d87b9fcf5-qnxjg 1/1 Running 0 103s 10.244.0.127 oncall-lab-control-plane \npod/db-5c45bf6fd6-nzswf 1/1 Running 0 103s 10.244.0.125 oncall-lab-control-plane \npod/synthetic-5cc5f987df-6gxg9 1/1 Running 0 103s 10.244.0.131 oncall-lab-control-plane \npod/web-86cc98785b-668qr 1/1 Running 0 16s 10.244.0.136 oncall-lab-control-plane \npod/web-86cc98785b-j6ldr 1/1 Running 0 16s 10.244.0.135 oncall-lab-control-plane \npod/worker-6644689959-lc575 1/1 Running 0 4s 10.244.0.137 oncall-lab-control-plane \n\nNAME ENDPOINTS AGE\nendpoints/api 10.244.0.126:8080,10.244.0.127:8080 103s\nendpoints/db 10.244.0.125:5432 103s\nendpoints/web 10.244.0.135:80,10.244.0.136:80 103s","more":0},{"t":25.1,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=20","out":"2026-11-04T18:08:08.166095696Z 2026-11-04T18:08:08Z GET /orders 504\n2026-11-04T18:08:12.179376213Z 2026-11-04T18:08:12Z GET /orders 504\n2026-11-04T18:08:16.193039196Z 2026-11-04T18:08:16Z GET /orders 504\n2026-11-04T18:08:20.199579834Z 2026-11-04T18:08:20Z GET /orders 504\n2026-11-04T18:08:24.215065926Z 2026-11-04T18:08:24Z GET /orders 504\n2026-11-04T18:08:28.226985079Z 2026-11-04T18:08:28Z GET /orders 504\n2026-11-04T18:08:32.234322868Z 2026-11-04T18:08:32Z GET /orders 504\n2026-11-04T18:08:36.247579588Z 2026-11-04T18:08:36Z GET /orders 504\n2026-11-04T18:08:40.265871567Z 2026-11-04T18:08:40Z GET /orders 504\n2026-11-04T18:08:44.283689258Z 2026-11-04T18:08:44Z GET /orders 504\n2026-11-04T18:08:48.300793703Z 2026-11-04T18:08:48Z GET /orders 504\n2026-11-04T18:08:52.317700406Z 2026-11-04T18:08:52Z GET /orders 504\n2026-11-04T18:08:56.328163108Z 2026-11-04T18:08:56Z GET /orders 504\n2026-11-04T18:08:58.337285089Z 2026-11-04T18:08:58Z GET /orders 200\n2026-11-04T18:09:00.349167241Z 2026-11-04T18:09:00Z GET /orders 200\n2026-11-04T18:09:02.360894916Z 2026-11-04T18:09:02Z GET /orders 200\n2026-11-04T18:09:04.367473655Z 2026-11-04T18:09:04Z GET /orders 200\n2026-11-04T18:09:06.372806992Z 2026-11-04T18:09:06Z GET /orders 200\n2026-11-04T18:09:08.377680391Z 2026-11-04T18:09:08Z GET /orders 200\n2026-11-04T18:09:10.387461728Z 2026-11-04T18:09:10Z GET /orders 200","more":0},{"t":28.4,"kind":"run","cmd":"kubectl -n shop get deployment web,worker -o wide","out":"Error from server (NotFound): deployments.apps \"web,worker\" not found","more":0},{"t":28.4,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --timestamps --tail=15","out":"2026-11-04T18:08:36.247579588Z 2026-11-04T18:08:36Z GET /orders 504\n2026-11-04T18:08:40.265871567Z 2026-11-04T18:08:40Z GET /orders 504\n2026-11-04T18:08:44.283689258Z 2026-11-04T18:08:44Z GET /orders 504\n2026-11-04T18:08:48.300793703Z 2026-11-04T18:08:48Z GET /orders 504\n2026-11-04T18:08:52.317700406Z 2026-11-04T18:08:52Z GET /orders 504\n2026-11-04T18:08:56.328163108Z 2026-11-04T18:08:56Z GET /orders 504\n2026-11-04T18:08:58.337285089Z 2026-11-04T18:08:58Z GET /orders 200\n2026-11-04T18:09:00.349167241Z 2026-11-04T18:09:00Z GET /orders 200\n2026-11-04T18:09:02.360894916Z 2026-11-04T18:09:02Z GET /orders 200\n2026-11-04T18:09:04.367473655Z 2026-11-04T18:09:04Z GET /orders 200\n2026-11-04T18:09:06.372806992Z 2026-11-04T18:09:06Z GET /orders 200\n2026-11-04T18:09:08.377680391Z 2026-11-04T18:09:08Z GET /orders 200\n2026-11-04T18:09:10.387461728Z 2026-11-04T18:09:10Z GET /orders 200\n2026-11-04T18:09:12.401398915Z 2026-11-04T18:09:12Z GET /orders 200\n2026-11-04T18:09:14.408132109Z 2026-11-04T18:09:14Z GET /orders 200","more":0},{"t":28.4,"kind":"run","cmd":"kubectl -n shop logs deploy/worker --timestamps --tail=30","out":"2026-11-04T18:09:08.296687107Z worker started, batch buffer 230 MiB\n2026-11-04T18:09:08.362548809Z processed batch\n2026-11-04T18:09:13.435719807Z processed batch","more":0}],"report":"IMPACT: `/orders` requests timed out or returned 504 from approximately 18:07:52 to 18:08:56 UTC. The worker was also unable to process batches after its 18:07:46 rollout.\n\nROOT CAUSE: `ConfigMap/shop/web-nginx-v3`, field `data.default.conf`, routed orders to `10.96.200.200:8080` rather than the API service. Separately, `Deployment/shop/worker` configured a 230 MiB batch buffer with a 192 MiB memory limit, causing OOM kills.\n\nACTIONS TAKEN:\n1. Rolled back `Deployment/shop/web` to its previous configuration.\n2. Raised the worker container’s memory limit from 192 MiB to 320 MiB.\n\nSTATUS: Mitigated. Both rollouts completed; synthetic probes returned HTTP 200 repeatedly from 18:08:58 through 18:09:14 UTC, and the worker logged two processed batches. The five-minute alert window has not yet been observed to clear.\n\nESCALATION: none.\n\nFOLLOW-UP: Add an `/orders` rollout check and correct the upstream in the deployment source before redeploying."}