{"id":"s6-gpt-6-luna-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%). synthetic probe reports status 000.","steps":[{"t":3.3,"kind":"say","text":"I’ll follow the runbook in order: establish the probe failure timing, inspect recent rollouts, then check the web/API/database path before making the smallest authorized change."},{"t":3.4,"kind":"run","cmd":"kubectl -n shop get pods,deploy,svc,endpoints,cm,events --sort-by=.metadata.creationTimestamp","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nerror: couldn't find any field with path \"{.metadata.creationTimestamp}\" in the list of objects","more":0},{"t":6.2,"kind":"run","cmd":"kubectl -n shop get deployments -o wide","out":"NAME        READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES                   SELECTOR\napi         2/2     2            2           84s   api          python:3.13-alpine       app=api\ndb          1/1     1            1           84s   postgres     postgres:17-alpine       app=db\nsynthetic   1/1     1            1           84s   curl         curlimages/curl:8.17.0   app=synthetic\nweb         2/2     2            2           84s   nginx        nginx:1.29-alpine        app=web\nworker      1/1     1            1           84s   worker       python:3.13-alpine       app=worker","more":0},{"t":6.3,"kind":"run","cmd":"kubectl -n shop get events --sort-by=.lastTimestamp","out":"LAST SEEN   TYPE      REASON              OBJECT                            MESSAGE\n84s         Normal    ScalingReplicaSet   deployment/db                     Scaled up replica set db-5c45bf6fd6 from 0 to 1\n84s         Normal    ScalingReplicaSet   deployment/worker                 Scaled up replica set worker-85767c58ff from 0 to 1\n84s         Normal    SuccessfulCreate    replicaset/worker-85767c58ff      Created pod: worker-85767c58ff-6txbv\n84s         Normal    Scheduled           pod/worker-85767c58ff-6txbv       Successfully assigned shop/worker-85767c58ff-6txbv to oncall-lab-control-plane\n84s         Normal    ScalingReplicaSet   deployment/web                    Scaled up replica set web-86cc98785b from 0 to 2\n84s         Normal    Scheduled           pod/api-7d87b9fcf5-nl8sn          Successfully assigned shop/api-7d87b9fcf5-nl8sn to oncall-lab-control-plane\n84s         Normal    SuccessfulCreate    replicaset/web-86cc98785b         Created pod: web-86cc98785b-tttqf\n84s         Normal    SuccessfulCreate    replicaset/web-86cc98785b         Created pod: web-86cc98785b-l2w5w\n84s         Normal    Scheduled           pod/web-86cc98785b-tttqf          Successfully assigned shop/web-86cc98785b-tttqf to oncall-lab-control-plane\n84s         Normal    Scheduled           pod/web-86cc98785b-l2w5w          Successfully assigned shop/web-86cc98785b-l2w5w to oncall-lab-control-plane\n84s         Normal    SuccessfulCreate    replicaset/api-7d87b9fcf5         Created pod: api-7d87b9fcf5-2mqd5\n84s         Normal    SuccessfulCreate    replicaset/api-7d87b9fcf5         Created pod: api-7d87b9fcf5-nl8sn\n84s         Normal    ScalingReplicaSet   deployment/api                    Scaled up replica set api-7d87b9fcf5 from 0 to 2\n84s         Normal    Scheduled           pod/db-5c45bf6fd6-mt6hm           Successfully assigned shop/db-5c45bf6fd6-mt6hm to oncall-lab-control-plane\n84s         Normal    ScalingReplicaSet   deployment/synthetic              Scaled up replica set synthetic-5cc5f987df from 0 to 1\n84s         Normal    SuccessfulCreate    replicaset/synthetic-5cc5f987df   Created pod: synthetic-5cc5f987df-4znbr\n84s         Normal    Scheduled           pod/api-7d87b9fcf5-2mqd5          Successfully assigned shop/api-7d87b9fcf5-2mqd5 to oncall-lab-control-plane\n84s         Normal    Scheduled           pod/synthetic-5cc5f987df-4znbr    Successfully assigned shop/synthetic-5cc5f987df-4znbr to oncall-lab-control-plane\n84s         Normal    SuccessfulCreate    replicaset/db-5c45bf6fd6          Created pod: db-5c45bf6fd6-mt6hm\n83s         Normal    Created             pod/synthetic-5cc5f987df-4znbr    Container created\n83s         Normal    Started             pod/api-7d87b9fcf5-nl8sn          Container started\n83s         Normal    Pulled              pod/synthetic-5cc5f987df-4znbr    Container image \"curlimages/curl:8.17.0\" already present on machine and can be accessed by the pod\n83s         Normal    Started             pod/db-5c45bf6fd6-mt6hm           Container started\n83s         Normal    Started             pod/synthetic-5cc5f987df-4znbr    Container started\n83s         Normal    Created             pod/db-5c45bf6fd6-mt6hm           Container created\n83s         Normal    Pulled              pod/db-5c45bf6fd6-mt6hm           Container image \"postgres:17-alpine\" already present on machine and can be accessed by the pod\n83s         Warning   Unhealthy           pod/api-7d87b9fcf5-nl8sn          Readiness probe failed: Get \"http://10.244.0.40:8080/healthz\": dial tcp 10.244.0.40:8080: connect: connection refused\n83s         Normal    Pulled              pod/web-86cc98785b-l2w5w          Container image \"nginx:1.29-alpine\" already present on machine and can be accessed by the pod\n83s         Normal    Created             pod/web-86cc98785b-l2w5w          Container created\n83s         Normal    Started             pod/web-86cc98785b-l2w5w          Container started\n83s         Warning   Unhealthy           pod/web-86cc98785b-l2w5","more":8},{"t":6.3,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --since=30m --timestamps","out":"2026-11-04T17:40:55.342431755Z 2026-11-04T17:40:55Z GET /orders 000\n2026-11-04T17:40:57.353922593Z 2026-11-04T17:40:57Z GET /orders 000\n2026-11-04T17:40:59.360207171Z 2026-11-04T17:40:59Z GET /orders 000\n2026-11-04T17:41:01.368459810Z 2026-11-04T17:41:01Z GET /orders 200\n2026-11-04T17:41:03.380261181Z 2026-11-04T17:41:03Z GET /orders 200\n2026-11-04T17:41:05.386032873Z 2026-11-04T17:41:05Z GET /orders 200\n2026-11-04T17:41:07.391702658Z 2026-11-04T17:41:07Z GET /orders 200\n2026-11-04T17:41:09.401720888Z 2026-11-04T17:41:09Z GET /orders 200\n2026-11-04T17:41:11.410571165Z 2026-11-04T17:41:11Z GET /orders 200\n2026-11-04T17:41:13.433956884Z 2026-11-04T17:41:13Z GET /orders 200\n2026-11-04T17:41:15.464874268Z 2026-11-04T17:41:15Z GET /orders 200\n2026-11-04T17:41:21.481255351Z 2026-11-04T17:41:21Z GET /orders 000\n2026-11-04T17:41:27.496890273Z 2026-11-04T17:41:27Z GET /orders 000\n2026-11-04T17:41:33.511317073Z 2026-11-04T17:41:33Z GET /orders 000\n2026-11-04T17:41:39.521612487Z 2026-11-04T17:41:39Z GET /orders 000\n2026-11-04T17:41:45.536517509Z 2026-11-04T17:41:45Z GET /orders 000\n2026-11-04T17:41:51.568352060Z 2026-11-04T17:41:51Z GET /orders 000\n2026-11-04T17:41:57.575304016Z 2026-11-04T17:41:57Z GET /orders 000\n2026-11-04T17:42:03.589210169Z 2026-11-04T17:42:03Z GET /orders 000\n2026-11-04T17:42:09.599834559Z 2026-11-04T17:42:09Z GET /orders 000\n2026-11-04T17:42:15.612006498Z 2026-11-04T17:42:15Z GET /orders 000","more":0},{"t":6.3,"kind":"run","cmd":"kubectl -n shop get deployments,pods,services,endpoints","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\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\n\nNAME                             READY   STATUS    RESTARTS   AGE\npod/api-7d87b9fcf5-2mqd5         1/1     Running   0          84s\npod/api-7d87b9fcf5-nl8sn         1/1     Running   0          84s\npod/db-5c45bf6fd6-mt6hm          1/1     Running   0          84s\npod/synthetic-5cc5f987df-4znbr   1/1     Running   0          84s\npod/web-86cc98785b-l2w5w         1/1     Running   0          84s\npod/web-86cc98785b-tttqf         1/1     Running   0          84s\npod/worker-85767c58ff-6txbv      1/1     Running   0          84s\n\nNAME          TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE\nservice/api   ClusterIP   10.96.24.19    <none>        8080/TCP   84s\nservice/db    ClusterIP   10.96.193.40   <none>        5432/TCP   84s\nservice/web   ClusterIP   10.96.45.224   <none>        80/TCP     84s\n\nNAME            ENDPOINTS                           AGE\nendpoints/api   10.244.0.39:8080,10.244.0.40:8080   84s\nendpoints/db    10.244.0.38:5432                    84s\nendpoints/web   10.244.0.42:80,10.244.0.43:80       84s","more":0},{"t":10.1,"kind":"run","cmd":"kubectl -n shop get deploy web api db -o yaml","out":"apiVersion: v1\nitems:\n- apiVersion: apps/v1\n  kind: Deployment\n  metadata:\n    annotations:\n      deployment.kubernetes.io/revision: \"1\"\n      kubectl.kubernetes.io/last-applied-configuration: |\n        {\"apiVersion\":\"apps/v1\",\"kind\":\"Deployment\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"web\"},\"name\":\"web\",\"namespace\":\"shop\"},\"spec\":{\"replicas\":2,\"selector\":{\"matchLabels\":{\"app\":\"web\"}},\"template\":{\"metadata\":{\"labels\":{\"app\":\"web\"}},\"spec\":{\"containers\":[{\"image\":\"nginx:1.29-alpine\",\"name\":\"nginx\",\"ports\":[{\"containerPort\":80}],\"readinessProbe\":{\"httpGet\":{\"path\":\"/healthz\",\"port\":80},\"periodSeconds\":5},\"volumeMounts\":[{\"mountPath\":\"/etc/nginx/conf.d\",\"name\":\"conf\"}]}],\"volumes\":[{\"configMap\":{\"name\":\"web-nginx\"},\"name\":\"conf\"}]}}}}\n    creationTimestamp: \"2026-11-04T17:40:53Z\"\n    generation: 1\n    labels:\n      app: web\n    name: web\n    namespace: shop\n    resourceVersion: \"307253\"\n    uid: 81524b89-0910-4b44-ba1f-627aa325ae78\n  spec:\n    progressDeadlineSeconds: 600\n    replicas: 2\n    revisionHistoryLimit: 10\n    selector:\n      matchLabels:\n        app: web\n    strategy:\n      rollingUpdate:\n        maxSurge: 25%\n        maxUnavailable: 25%\n      type: RollingUpdate\n    template:\n      metadata:\n        labels:\n          app: web\n      spec:\n        containers:\n        - image: nginx:1.29-alpine\n          imagePullPolicy: IfNotPresent\n          name: nginx\n          ports:\n          - containerPort: 80","more":241},{"t":10.1,"kind":"run","cmd":"kubectl -n shop logs deploy/db --since=15m --timestamps","out":"2026-11-04T17:40:54.279762246Z The files belonging to this database system will be owned by user \"postgres\".\n2026-11-04T17:40:54.279779079Z This user must also own the server process.\n2026-11-04T17:40:54.279780037Z \n2026-11-04T17:40:54.279897371Z The database cluster will be initialized with locale \"en_US.utf8\".\n2026-11-04T17:40:54.279899246Z The default database encoding has accordingly been set to \"UTF8\".\n2026-11-04T17:40:54.279900038Z The default text search configuration will be set to \"english\".\n2026-11-04T17:40:54.279900454Z \n2026-11-04T17:40:54.279901579Z Data page checksums are disabled.\n2026-11-04T17:40:54.279931288Z \n2026-11-04T17:40:54.279949746Z fixing permissions on existing directory /var/lib/postgresql/data/pgdata ... ok\n2026-11-04T17:40:54.280060080Z creating subdirectories ... ok\n2026-11-04T17:40:54.280116622Z selecting dynamic shared memory implementation ... posix\n2026-11-04T17:40:54.288890364Z selecting default \"max_connections\" ... 100\n2026-11-04T17:40:54.298927986Z selecting default \"shared_buffers\" ... 128MB\n2026-11-04T17:40:54.317935268Z selecting default time zone ... UTC\n2026-11-04T17:40:54.318199935Z creating configuration files ... ok\n2026-11-04T17:40:54.387788911Z running bootstrap script ... ok\n2026-11-04T17:40:54.455573256Z sh: locale: not found\n2026-11-04T17:40:54.455598089Z 2026-11-04 17:40:54.455 UTC [49] WARNING:  no usable system locales were found\n2026-11-04T17:40:54.601694360Z performing post-bootstrap initialization ... ok\n2026-11-04T17:40:54.604075703Z syncing data to disk ... ok\n2026-11-04T17:40:54.604085453Z \n2026-11-04T17:40:54.604086244Z \n2026-11-04T17:40:54.604087453Z Success. You can now start the database server using:\n2026-11-04T17:40:54.604087911Z \n2026-11-04T17:40:54.604088494Z     pg_ctl -D /var/lib/postgresql/data/pgdata -l logfile start\n2026-11-04T17:40:54.604088911Z \n2026-11-04T17:40:54.604088119Z initdb: warning: enabling \"trust\" authentication for local connections\n2026-11-04T17:40:54.604093453Z 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.\n2026-11-04T17:40:54.622254856Z waiting for server to start....2026-11-04 17:40:54.622 UTC [61] LOG:  starting PostgreSQL 17.11 on aarch64-unknown-linux-musl, compiled by gcc (Alpine 15.2.0) 15.2.0, 64-bit\n2026-11-04T17:40:54.622909775Z 2026-11-04 17:40:54.622 UTC [61] LOG:  listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n2026-11-04T17:40:54.623856904Z 2026-11-04 17:40:54.623 UTC [64] LOG:  database system was shut down at 2026-11-04 17:40:54 UTC\n2026-11-04T17:40:54.625400618Z 2026-11-04 17:40:54.625 UTC [61] LOG:  database system is ready to accept connections\n2026-11-04T17:40:54.715442923Z  done\n2026-11-04T17:40:54.715462256Z server started\n2026-11-04T17:40:54.722896910Z \n2026-11-04T17:40:54.722909660Z /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*\n2026-11-04T17:40:54.722910452Z \n2026-11-04T17:40:54.723270412Z waiting for server to shut down....2026-11-04 17:40:54.723 UTC [61] LOG:  received fast shutdown request\n2026-11-04T17:40:54.723274870Z 2026-11-04 17:40:54.723 UTC [61] LOG:  aborting any active transactions","more":16},{"t":10.1,"kind":"run","cmd":"kubectl -n shop logs deploy/api --all-pods=true --since=15m --timestamps","out":"[pod/api-7d87b9fcf5-2mqd5/api] 2026-11-04T17:40:54.384345565Z api listening on 8080, db=db:5432\n[pod/api-7d87b9fcf5-nl8sn/api] 2026-11-04T17:40:54.411226460Z api listening on 8080, db=db:5432","more":0},{"t":10.1,"kind":"run","cmd":"kubectl -n shop logs deploy/web --all-pods=true --since=15m --timestamps","out":"[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.219356388Z /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.219369263Z /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.225540912Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.226112747Z 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-tttqf/nginx] 2026-11-04T17:40:54.226120497Z /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.226121872Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.231118975Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.231127308Z /docker-entrypoint.sh: Configuration complete; ready for start up\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.276978818Z 2026/11/04 17:40:54 [notice] 1#1: using the \"epoll\" event method\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.277030235Z 2026/11/04 17:40:54 [notice] 1#1: nginx/1.29.8\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.277032110Z 2026/11/04 17:40:54 [notice] 1#1: built by gcc 15.2.0 (Alpine 15.2.0) \n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.277033027Z 2026/11/04 17:40:54 [notice] 1#1: OS: Linux 6.8.0-117-generic\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.277033818Z 2026/11/04 17:40:54 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1073741816:1073741816\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.277034277Z 2026/11/04 17:40:54 [notice] 1#1: start worker processes\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.280955958Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 28\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.281058126Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 29\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.281195543Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 30\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.281311293Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 31\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.284562722Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 32\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.284802432Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 33\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.284912390Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 34\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.285024432Z 2026/11/04 17:40:54 [notice] 1#1: start worker process 35\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.492256272Z 2026/11/04 17:40:54 [error] 29#29: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 10.244.0.1, server: , request: \"GET /healthz HTTP/1.1\", upstream: \"http://10.96.24.19:8080/healthz\", host: \"10.244.0.43:80\"\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:54.492260147Z 10.244.0.1 - - [04/Nov/2026:17:40:54 +0000] \"GET /healthz HTTP/1.1\" 502 157 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:40:59.495851904Z 10.244.0.1 - - [04/Nov/2026:17:40:59 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:41:03.378804592Z 10.244.0.44 - - [04/Nov/2026:17:41:03 +0000] \"GET /orders HTTP/1.1\" 200 36 \"-\" \"curl/8.17.0\" \"-\"\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:41:04.494395665Z 10.244.0.1 - - [04/Nov/2026:17:41:04 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-tttqf/nginx] 2026-11-04T17:41:04.631191862Z 10.244.0.44 - - [04/Nov/2026:17:41:04 +00","more":60},{"t":10.2,"kind":"run","cmd":"kubectl -n shop rollout history deploy/web && kubectl -n shop rollout history deploy/api && kubectl -n shop rollout history deploy/db","out":"deployment.apps/web \nREVISION  CHANGE-CAUSE\n1         <none>\n\ndeployment.apps/api \nREVISION  CHANGE-CAUSE\n1         <none>\n\ndeployment.apps/db \nREVISION  CHANGE-CAUSE\n1         <none>","more":0},{"t":16.1,"kind":"say","text":"The initial 000s at 17:40:55–59 were startup transients, followed by successful 200s. Failures resume at 17:41:21; web/API/DB pods and endpoints are currently ready, so I’m checking whether the probe can resolve and reach `web` and whether CoreDNS changed at that time."},{"t":16.2,"kind":"run","cmd":"kubectl -n kube-system get events --sort-by=.lastTimestamp","out":"LAST SEEN   TYPE      REASON              OBJECT                          MESSAGE\n60m         Normal    Scheduled           pod/coredns-58d49f4bd9-x57m2    Successfully assigned kube-system/coredns-58d49f4bd9-x57m2 to oncall-lab-control-plane\n60m         Normal    ScalingReplicaSet   deployment/coredns              Scaled up replica set coredns-58d49f4bd9 from 0 to 2\n60m         Normal    SuccessfulCreate    replicaset/coredns-58d49f4bd9   Created pod: coredns-58d49f4bd9-7wmtg\n60m         Normal    SuccessfulCreate    replicaset/coredns-58d49f4bd9   Created pod: coredns-58d49f4bd9-x57m2\n60m         Normal    Scheduled           pod/coredns-58d49f4bd9-7wmtg    Successfully assigned kube-system/coredns-58d49f4bd9-7wmtg to oncall-lab-control-plane\n60m         Normal    Created             pod/coredns-58d49f4bd9-x57m2    Container created\n60m         Normal    Pulled              pod/coredns-58d49f4bd9-x57m2    Container image \"registry.k8s.io/coredns/coredns:v1.14.6\" already present on machine and can be accessed by the pod\n60m         Normal    Started             pod/coredns-58d49f4bd9-x57m2    Container started\n60m         Normal    Started             pod/coredns-58d49f4bd9-7wmtg    Container started\n60m         Normal    Created             pod/coredns-58d49f4bd9-7wmtg    Container created\n60m         Normal    Pulled              pod/coredns-58d49f4bd9-7wmtg    Container image \"registry.k8s.io/coredns/coredns:v1.14.6\" already present on machine and can be accessed by the pod\n77s         Normal    Killing             pod/coredns-58d49f4bd9-7wmtg    Stopping container coredns\n77s         Normal    Killing             pod/coredns-58d49f4bd9-x57m2    Stopping container coredns\n77s         Normal    SuccessfulDelete    replicaset/coredns-58d49f4bd9   Deleted pod: coredns-58d49f4bd9-7wmtg\n77s         Normal    SuccessfulDelete    replicaset/coredns-58d49f4bd9   Deleted pod: coredns-58d49f4bd9-x57m2\n77s         Normal    ScalingReplicaSet   deployment/coredns              Scaled down replica set coredns-58d49f4bd9 from 2 to 0\n73s         Warning   Unhealthy           pod/coredns-58d49f4bd9-7wmtg    Readiness probe failed: Get \"http://10.244.0.157:8181/ready\": dial tcp 10.244.0.157:8181: connect: connection refused\n73s         Warning   Unhealthy           pod/coredns-58d49f4bd9-x57m2    Readiness probe failed: Get \"http://10.244.0.156:8181/ready\": dial tcp 10.244.0.156:8181: connect: connection refused","more":0},{"t":16.2,"kind":"run","cmd":"kubectl -n kube-system get deploy,pods,svc,endpoints,cm","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME                      READY   UP-TO-DATE   AVAILABLE   AGE\ndeployment.apps/coredns   0/0     0            0           38h\n\nNAME                                                   READY   STATUS    RESTARTS       AGE\npod/etcd-oncall-lab-control-plane                      1/1     Running   1 (6h6m ago)   38h\npod/kindnet-mpj27                                      1/1     Running   0              38h\npod/kube-apiserver-oncall-lab-control-plane            1/1     Running   2 (8h ago)     38h\npod/kube-controller-manager-oncall-lab-control-plane   1/1     Running   1 (8h ago)     38h\npod/kube-proxy-hgvm7                                   1/1     Running   0              38h\npod/kube-scheduler-oncall-lab-control-plane            1/1     Running   2 (8h ago)     38h\n\nNAME               TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)                  AGE\nservice/kube-dns   ClusterIP   10.96.0.10   <none>        53/UDP,53/TCP,9153/TCP   38h\n\nNAME                 ENDPOINTS   AGE\nendpoints/kube-dns   <none>      38h\n\nNAME                                                             DATA   AGE\nconfigmap/coredns                                                1      38h\nconfigmap/extension-apiserver-authentication                     6      38h\nconfigmap/kube-apiserver-legacy-service-account-token-tracking   1      38h\nconfigmap/kube-proxy                                             2      38h\nconfigmap/kube-root-ca.crt                                       1      38h\nconfigmap/kubeadm-config                                         1      38h\nconfigmap/kubelet-config                                         1      38h","more":0},{"t":16.3,"kind":"run","cmd":"kubectl -n shop describe pod -l app=synthetic && kubectl -n shop get configmap web-nginx api-config -o yaml","out":"Name:             synthetic-5cc5f987df-4znbr\nNamespace:        shop\nPriority:         0\nService Account:  default\nNode:             oncall-lab-control-plane/172.22.0.2\nStart Time:       Wed, 04 Nov 2026 17:40:53 +0000\nLabels:           app=synthetic\n                  pod-template-hash=5cc5f987df\nAnnotations:      <none>\nStatus:           Running\nIP:               10.244.0.44\nIPs:\n  IP:           10.244.0.44\nControlled By:  ReplicaSet/synthetic-5cc5f987df\nContainers:\n  curl:\n    Container ID:  containerd://bea6812421a612efd96e7f1f1d2b01e348bc5386775122528331f9728d0d96e3\n    Image:         curlimages/curl:8.17.0\n    Image ID:      docker.io/curlimages/curl@sha256:935d9100e9ba842cdb060de42472c7ca90cfe9a7c96e4dacb55e79e560b3ff40\n    Port:          <none>\n    Host Port:     <none>\n    Command:\n      sh\n      -c\n      while true; do c=$(curl -s -o /dev/null -w \"%{http_code}\" -m 4 http://web/orders); echo \"$(date -u +%FT%TZ) GET /orders $c\"; sleep 2; done\n    State:          Running\n      Started:      Wed, 04 Nov 2026 17:40:54 +0000\n    Ready:          True\n    Restart Count:  0\n    Environment:    <none>\n    Mounts:\n      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-k2n8k (ro)\nConditions:\n  Type                        Status\n  PodReadyToStartContainers   True \n  Initialized                 True \n  Ready                       True \n  ContainersReady             True \n  PodScheduled                True \nVolumes:","more":53},{"t":19.3,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- sh -c 'date -u; cat /etc/resolv.conf; nslookup web; curl -sv --connect-timeout 3 http://web/orders'","out":"Wed Nov  4 17:42:27 UTC 2026\nsearch shop.svc.cluster.local svc.cluster.local cluster.local\nnameserver 10.96.0.10\noptions ndots:5\n;; connection timed out; no servers could be reached\n\nnslookup: write to '10.96.0.10': Connection refused\n* Resolving timed out after 3002 milliseconds\n* closing connection #0\ncommand terminated with exit code 28","more":0},{"t":36.3,"kind":"run","cmd":"kubectl -n kube-system logs deploy/coredns --all-pods=true --since=20m --timestamps","out":"error: timed out waiting for the condition","more":0},{"t":42.5,"kind":"say","text":"Confirmed the network-layer failure: the synthetic pod’s DNS server (`10.96.0.10`) refuses queries, and `kube-system/coredns` has been scaled from 2 replicas to 0. Shop’s services and endpoints are intact; I’m restoring the previous CoreDNS replica count (2), which is within the runbook’s add-on authority."},{"t":53.1,"kind":"run","cmd":"kubectl -n kube-system scale deployment/coredns --replicas=2 && kubectl -n kube-system rollout status deployment/coredns --timeout=120s","out":"deployment.apps/coredns scaled\nWaiting for deployment \"coredns\" rollout to finish: 0 of 2 updated replicas are available...\nWaiting for deployment \"coredns\" rollout to finish: 1 of 2 updated replicas are available...\ndeployment \"coredns\" successfully rolled out","more":0},{"t":57.4,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --since=3m --timestamps","out":"2026-11-04T17:40:55.342431755Z 2026-11-04T17:40:55Z GET /orders 000\n2026-11-04T17:40:57.353922593Z 2026-11-04T17:40:57Z GET /orders 000\n2026-11-04T17:40:59.360207171Z 2026-11-04T17:40:59Z GET /orders 000\n2026-11-04T17:41:01.368459810Z 2026-11-04T17:41:01Z GET /orders 200\n2026-11-04T17:41:03.380261181Z 2026-11-04T17:41:03Z GET /orders 200\n2026-11-04T17:41:05.386032873Z 2026-11-04T17:41:05Z GET /orders 200\n2026-11-04T17:41:07.391702658Z 2026-11-04T17:41:07Z GET /orders 200\n2026-11-04T17:41:09.401720888Z 2026-11-04T17:41:09Z GET /orders 200\n2026-11-04T17:41:11.410571165Z 2026-11-04T17:41:11Z GET /orders 200\n2026-11-04T17:41:13.433956884Z 2026-11-04T17:41:13Z GET /orders 200\n2026-11-04T17:41:15.464874268Z 2026-11-04T17:41:15Z GET /orders 200\n2026-11-04T17:41:21.481255351Z 2026-11-04T17:41:21Z GET /orders 000\n2026-11-04T17:41:27.496890273Z 2026-11-04T17:41:27Z GET /orders 000\n2026-11-04T17:41:33.511317073Z 2026-11-04T17:41:33Z GET /orders 000\n2026-11-04T17:41:39.521612487Z 2026-11-04T17:41:39Z GET /orders 000\n2026-11-04T17:41:45.536517509Z 2026-11-04T17:41:45Z GET /orders 000\n2026-11-04T17:41:51.568352060Z 2026-11-04T17:41:51Z GET /orders 000\n2026-11-04T17:41:57.575304016Z 2026-11-04T17:41:57Z GET /orders 000\n2026-11-04T17:42:03.589210169Z 2026-11-04T17:42:03Z GET /orders 000\n2026-11-04T17:42:09.599834559Z 2026-11-04T17:42:09Z GET /orders 000\n2026-11-04T17:42:15.612006498Z 2026-11-04T17:42:15Z GET /orders 000\n2026-11-04T17:42:21.630261002Z 2026-11-04T17:42:21Z GET /orders 000\n2026-11-04T17:42:27.645902577Z 2026-11-04T17:42:27Z GET /orders 000\n2026-11-04T17:42:33.659891934Z 2026-11-04T17:42:33Z GET /orders 000\n2026-11-04T17:42:39.679934563Z 2026-11-04T17:42:39Z GET /orders 000\n2026-11-04T17:42:45.694121872Z 2026-11-04T17:42:45Z GET /orders 000\n2026-11-04T17:42:51.706562459Z 2026-11-04T17:42:51Z GET /orders 000\n2026-11-04T17:42:56.218989495Z 2026-11-04T17:42:56Z GET /orders 200\n2026-11-04T17:42:58.238311734Z 2026-11-04T17:42:58Z GET /orders 200\n2026-11-04T17:43:00.245965934Z 2026-11-04T17:43:00Z GET /orders 200\n2026-11-04T17:43:02.259952876Z 2026-11-04T17:43:02Z GET /orders 200\n2026-11-04T17:43:04.264768206Z 2026-11-04T17:43:04Z GET /orders 200\n2026-11-04T17:43:06.269928421Z 2026-11-04T17:43:06Z GET /orders 200\n2026-11-04T17:43:08.283373636Z 2026-11-04T17:43:08Z GET /orders 200","more":0},{"t":57.4,"kind":"run","cmd":"kubectl -n shop get deployments,pods,endpoints","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME                        READY   UP-TO-DATE   AVAILABLE   AGE\ndeployment.apps/api         2/2     2            2           2m15s\ndeployment.apps/db          1/1     1            1           2m15s\ndeployment.apps/synthetic   1/1     1            1           2m15s\ndeployment.apps/web         2/2     2            2           2m15s\ndeployment.apps/worker      1/1     1            1           2m15s\n\nNAME                             READY   STATUS    RESTARTS   AGE\npod/api-7d87b9fcf5-2mqd5         1/1     Running   0          2m15s\npod/api-7d87b9fcf5-nl8sn         1/1     Running   0          2m15s\npod/db-5c45bf6fd6-mt6hm          1/1     Running   0          2m15s\npod/synthetic-5cc5f987df-4znbr   1/1     Running   0          2m15s\npod/web-86cc98785b-l2w5w         1/1     Running   0          2m15s\npod/web-86cc98785b-tttqf         1/1     Running   0          2m15s\npod/worker-85767c58ff-6txbv      1/1     Running   0          2m15s\n\nNAME            ENDPOINTS                           AGE\nendpoints/api   10.244.0.39:8080,10.244.0.40:8080   2m15s\nendpoints/db    10.244.0.38:5432                    2m15s\nendpoints/web   10.244.0.42:80,10.244.0.43:80       2m15s","more":0},{"t":57.4,"kind":"run","cmd":"kubectl -n kube-system get deploy,pods,endpoints kube-dns coredns -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/coredns   2/2     2            2           38h   coredns      registry.k8s.io/coredns/coredns:v1.14.6   k8s-app=kube-dns\n\nNAME                 ENDPOINTS                                                      AGE\nendpoints/kube-dns   10.244.0.45:9153,10.244.0.46:9153,10.244.0.45:53 + 3 more...   38h\nError from server (NotFound): deployments.apps \"kube-dns\" not found\nError from server (NotFound): pods \"kube-dns\" not found\nError from server (NotFound): pods \"coredns\" not found\nError from server (NotFound): endpoints \"coredns\" not found","more":0},{"t":57.4,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- sh -c 'nslookup web && curl -sS --connect-timeout 3 -w \" status=%{http_code}\\n\" -o /dev/null http://web/orders'","out":"Server:\t\t10.96.0.10\nAddress:\t10.96.0.10:53\n\n** server can't find web.cluster.local: NXDOMAIN\n\n** server can't find web.svc.cluster.local: NXDOMAIN\n\n** server can't find web.cluster.local: NXDOMAIN\n\nName:\tweb.shop.svc.cluster.local\nAddress: 10.96.45.224\n\n\n** server can't find web.svc.cluster.local: NXDOMAIN\n\ncommand terminated with exit code 1","more":0},{"t":64.8,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --since=20s --timestamps","out":"2026-11-04T17:42:56.218989495Z 2026-11-04T17:42:56Z GET /orders 200\n2026-11-04T17:42:58.238311734Z 2026-11-04T17:42:58Z GET /orders 200\n2026-11-04T17:43:00.245965934Z 2026-11-04T17:43:00Z GET /orders 200\n2026-11-04T17:43:02.259952876Z 2026-11-04T17:43:02Z GET /orders 200\n2026-11-04T17:43:04.264768206Z 2026-11-04T17:43:04Z GET /orders 200\n2026-11-04T17:43:06.269928421Z 2026-11-04T17:43:06Z GET /orders 200\n2026-11-04T17:43:08.283373636Z 2026-11-04T17:43:08Z GET /orders 200\n2026-11-04T17:43:10.290996044Z 2026-11-04T17:43:10Z GET /orders 200\n2026-11-04T17:43:12.313509439Z 2026-11-04T17:43:12Z GET /orders 200\n2026-11-04T17:43:14.320463028Z 2026-11-04T17:43:14Z GET /orders 200","more":0},{"t":64.8,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- sh -c 'curl -sS --connect-timeout 3 -w \" HTTP %{http_code}\\n\" -o /dev/null http://web.shop.svc.cluster.local/orders'","out":" HTTP 200","more":0},{"t":64.9,"kind":"run","cmd":"kubectl -n kube-system get deployment coredns -o jsonpath='replicas={.spec.replicas} ready={.status.readyReplicas} available={.status.availableReplicas}{\"\\n\"}' && kubectl -n kube-system get endpoints kube-dns","out":"replicas=2 ready=2 available=2\nWarning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME       ENDPOINTS                                                      AGE\nkube-dns   10.244.0.45:9153,10.244.0.46:9153,10.244.0.45:53 + 3 more...   38h","more":0}],"report":"IMPACT: `shop/web /orders` requests failed with status 000 from 17:41:21 to 17:42:56 UTC on 2026-11-04. Earlier startup failures ended at 17:40:59; requests then returned 200 until the incident.\n\nROOT CAUSE: Deployment `kube-system/coredns`, field `spec.replicas` was 0, leaving `kube-dns` without endpoints and preventing service-name resolution.\n\nACTIONS TAKEN:\n1. Scaled `kube-system/deployment/coredns` from 0 to 2 replicas.\n2. Verified CoreDNS had 2/2 ready replicas and `kube-dns` endpoints; confirmed a direct `/orders` request returned HTTP 200 and synthetic probes continued returning 200.\n\nSTATUS: resolved. Synthetic logs show consecutive 200s from 17:42:56 UTC onward; the direct request also returned HTTP 200.\n\nESCALATION: none.\n\nFOLLOW-UP: Determine what scaled CoreDNS to zero and add an alert for CoreDNS having no ready replicas."}