{"id":"s6-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%). synthetic probe reports status 000.","steps":[{"t":4.2,"kind":"say","text":"I’ll establish when the failures began, then check rollouts and the request path before making the smallest authorized change."},{"t":4.3,"kind":"run","cmd":"kubectl -n shop get events --sort-by=.lastTimestamp","out":"LAST SEEN TYPE REASON OBJECT MESSAGE\n82s Normal Scheduled pod/api-7d87b9fcf5-bpfbz Successfully assigned shop/api-7d87b9fcf5-bpfbz to oncall-lab-control-plane\n82s Normal ScalingReplicaSet deployment/worker Scaled up replica set worker-85767c58ff from 0 to 1\n82s Normal SuccessfulCreate replicaset/worker-85767c58ff Created pod: worker-85767c58ff-sg5wn\n82s Normal Scheduled pod/worker-85767c58ff-sg5wn Successfully assigned shop/worker-85767c58ff-sg5wn to oncall-lab-control-plane\n82s Normal ScalingReplicaSet deployment/web Scaled up replica set web-86cc98785b from 0 to 2\n82s Normal Scheduled pod/api-7d87b9fcf5-fhn48 Successfully assigned shop/api-7d87b9fcf5-fhn48 to oncall-lab-control-plane\n82s Normal SuccessfulCreate replicaset/web-86cc98785b Created pod: web-86cc98785b-bsmw6\n82s Normal SuccessfulCreate replicaset/web-86cc98785b Created pod: web-86cc98785b-flvc4\n82s Normal Scheduled pod/web-86cc98785b-flvc4 Successfully assigned shop/web-86cc98785b-flvc4 to oncall-lab-control-plane\n82s Normal Scheduled pod/web-86cc98785b-bsmw6 Successfully assigned shop/web-86cc98785b-bsmw6 to oncall-lab-control-plane\n82s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-fhn48\n82s Normal SuccessfulCreate replicaset/api-7d87b9fcf5 Created pod: api-7d87b9fcf5-bpfbz\n82s Normal ScalingReplicaSet deployment/api Scaled up replica set api-7d87b9fcf5 from 0 to 2\n82s Normal Scheduled pod/db-5c45bf6fd6-cqcjz Successfully assigned shop/db-5c45bf6fd6-cqcjz to oncall-lab-control-plane\n82s Normal Pulled pod/db-5c45bf6fd6-cqcjz Container image \"postgres:17-alpine\" already present on machine and can be accessed by the pod\n82s Normal Created pod/db-5c45bf6fd6-cqcjz Container created\n82s Normal ScalingReplicaSet deployment/synthetic Scaled up replica set synthetic-5cc5f987df from 0 to 1\n82s Normal SuccessfulCreate replicaset/synthetic-5cc5f987df Created pod: synthetic-5cc5f987df-6mckc\n82s Normal SuccessfulCreate replicaset/db-5c45bf6fd6 Created pod: db-5c45bf6fd6-cqcjz\n82s Normal ScalingReplicaSet deployment/db Scaled up replica set db-5c45bf6fd6 from 0 to 1\n82s Normal Scheduled pod/synthetic-5cc5f987df-6mckc Successfully assigned shop/synthetic-5cc5f987df-6mckc to oncall-lab-control-plane\n81s Normal Created pod/synthetic-5cc5f987df-6mckc Container created\n81s Normal Created pod/web-86cc98785b-flvc4 Container created\n81s Normal Started pod/synthetic-5cc5f987df-6mckc Container started\n81s Warning Unhealthy pod/db-5c45bf6fd6-cqcjz Readiness probe failed: /var/run/postgresql:5432 - no response\n81s Normal Started pod/db-5c45bf6fd6-cqcjz Container started\n81s Warning Unhealthy pod/api-7d87b9fcf5-fhn48 Readiness probe failed: Get \"http://10.244.0.150:8080/healthz\": dial tcp 10.244.0.150:8080: connect: connection refused\n81s Normal Pulled pod/web-86cc98785b-bsmw6 Container image \"nginx:1.29-alpine\" already present on machine and can be accessed by the pod\n81s Normal Created pod/web-86cc98785b-bsmw6 Container created\n81s Normal Started pod/web-86cc98785b-bsmw6 Container started\n81s Warning Unhealthy pod/web-86cc98785b-bsmw6 Readiness probe failed:","more":8},{"t":4.3,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --tail=150 --timestamps","out":"2026-11-04T16:40:46.319202113Z 2026-11-04T16:40:46Z GET /orders 000\n2026-11-04T16:40:48.327592833Z 2026-11-04T16:40:48Z GET /orders 000\n2026-11-04T16:40:50.332595102Z 2026-11-04T16:40:50Z GET /orders 000\n2026-11-04T16:40:52.338702134Z 2026-11-04T16:40:52Z GET /orders 200\n2026-11-04T16:40:54.345884263Z 2026-11-04T16:40:54Z GET /orders 200\n2026-11-04T16:40:56.351756484Z 2026-11-04T16:40:56Z GET /orders 200\n2026-11-04T16:40:58.358583427Z 2026-11-04T16:40:58Z GET /orders 200\n2026-11-04T16:41:00.366160133Z 2026-11-04T16:41:00Z GET /orders 200\n2026-11-04T16:41:02.376842729Z 2026-11-04T16:41:02Z GET /orders 200\n2026-11-04T16:41:04.396278515Z 2026-11-04T16:41:04Z GET /orders 200\n2026-11-04T16:41:06.401900794Z 2026-11-04T16:41:06Z GET /orders 200\n2026-11-04T16:41:12.412077814Z 2026-11-04T16:41:12Z GET /orders 000\n2026-11-04T16:41:18.424888021Z 2026-11-04T16:41:18Z GET /orders 000\n2026-11-04T16:41:24.435822492Z 2026-11-04T16:41:24Z GET /orders 000\n2026-11-04T16:41:30.447715187Z 2026-11-04T16:41:30Z GET /orders 000\n2026-11-04T16:41:36.462764984Z 2026-11-04T16:41:36Z GET /orders 000\n2026-11-04T16:41:42.472844036Z 2026-11-04T16:41:42Z GET /orders 000\n2026-11-04T16:41:48.480389137Z 2026-11-04T16:41:48Z GET /orders 000\n2026-11-04T16:41:54.496583970Z 2026-11-04T16:41:54Z GET /orders 000\n2026-11-04T16:42:00.511185102Z 2026-11-04T16:42:00Z GET /orders 000","more":0},{"t":4.3,"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 82s api python:3.13-alpine app=api\ndeployment.apps/db 1/1 1 1 82s postgres postgres:17-alpine app=db\ndeployment.apps/synthetic 1/1 1 1 82s curl curlimages/curl:8.17.0 app=synthetic\ndeployment.apps/web 2/2 2 2 82s nginx nginx:1.29-alpine app=web\ndeployment.apps/worker 1/1 1 1 82s worker python:3.13-alpine app=worker\n\nNAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES\npod/api-7d87b9fcf5-bpfbz 1/1 Running 0 82s 10.244.0.151 oncall-lab-control-plane \npod/api-7d87b9fcf5-fhn48 1/1 Running 0 82s 10.244.0.150 oncall-lab-control-plane \npod/db-5c45bf6fd6-cqcjz 1/1 Running 0 82s 10.244.0.149 oncall-lab-control-plane \npod/synthetic-5cc5f987df-6mckc 1/1 Running 0 82s 10.244.0.155 oncall-lab-control-plane \npod/web-86cc98785b-bsmw6 1/1 Running 0 82s 10.244.0.154 oncall-lab-control-plane \npod/web-86cc98785b-flvc4 1/1 Running 0 82s 10.244.0.153 oncall-lab-control-plane \npod/worker-85767c58ff-sg5wn 1/1 Running 0 82s 10.244.0.152 oncall-lab-control-plane \n\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR\nservice/api ClusterIP 10.96.76.76 8080/TCP 82s app=api\nservice/db ClusterIP 10.96.152.192 5432/TCP 82s app=db\nservice/web ClusterIP 10.96.212.225 80/TCP 82s app=web\n\nNAME ENDPOINTS AGE\nendpoints/api 10.244.0.150:8080,10.244.0.151:8080 82s\nendpoints/db 10.244.0.149:5432 82s\nendpoints/web 10.244.0.153:80,10.244.0.154:80 82s","more":0},{"t":11.0,"kind":"say","text":"The probe briefly returned 200 before sustained status 000 responses began at 16:41:12 UTC. The web, API and database pods and endpoints are currently ready, so I’m checking DNS and request-path logs as well as rollout history."},{"t":11.1,"kind":"run","cmd":"kubectl -n kube-system get deployment coredns -o wide","out":"NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR\ncoredns 0/0 0 0 37h coredns registry.k8s.io/coredns/coredns:v1.14.6 k8s-app=kube-dns","more":0},{"t":11.1,"kind":"run","cmd":"kubectl -n kube-system get pods,svc,endpoints -l k8s-app=kube-dns -o wide","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR\nservice/kube-dns ClusterIP 10.96.0.10 53/UDP,53/TCP,9153/TCP 37h k8s-app=kube-dns\n\nNAME ENDPOINTS AGE\nendpoints/kube-dns 37h","more":0},{"t":11.1,"kind":"run","cmd":"kubectl -n shop rollout history deployment/db","out":"deployment.apps/db \nREVISION CHANGE-CAUSE\n1 ","more":0},{"t":11.1,"kind":"run","cmd":"kubectl -n shop rollout history deployment/api","out":"deployment.apps/api \nREVISION CHANGE-CAUSE\n1 ","more":0},{"t":11.1,"kind":"run","cmd":"kubectl -n shop logs deployment/db --tail=80 --timestamps","out":"2026-11-04T16:40:45.059257990Z The files belonging to this database system will be owned by user \"postgres\".\n2026-11-04T16:40:45.059282990Z This user must also own the server process.\n2026-11-04T16:40:45.059284115Z \n2026-11-04T16:40:45.059284782Z The database cluster will be initialized with locale \"en_US.utf8\".\n2026-11-04T16:40:45.059285324Z The default database encoding has accordingly been set to \"UTF8\".\n2026-11-04T16:40:45.059285824Z The default text search configuration will be set to \"english\".\n2026-11-04T16:40:45.059286240Z \n2026-11-04T16:40:45.059286699Z Data page checksums are disabled.\n2026-11-04T16:40:45.059287115Z \n2026-11-04T16:40:45.059288282Z fixing permissions on existing directory /var/lib/postgresql/data/pgdata ... ok\n2026-11-04T16:40:45.059288865Z creating subdirectories ... ok\n2026-11-04T16:40:45.059291074Z selecting dynamic shared memory implementation ... posix\n2026-11-04T16:40:45.066536875Z selecting default \"max_connections\" ... 100\n2026-11-04T16:40:45.077244305Z selecting default \"shared_buffers\" ... 128MB\n2026-11-04T16:40:45.095470787Z selecting default time zone ... UTC\n2026-11-04T16:40:45.095806454Z creating configuration files ... ok\n2026-11-04T16:40:45.172391303Z running bootstrap script ... ok\n2026-11-04T16:40:45.266920008Z sh: locale: not found\n2026-11-04T16:40:45.266933549Z 2026-11-04 16:40:45.266 UTC [49] WARNING: no usable system locales were found\n2026-11-04T16:40:45.424513252Z performing post-bootstrap initialization ... ok\n2026-11-04T16:40:45.427034172Z syncing data to disk ... ok\n2026-11-04T16:40:45.427045922Z \n2026-11-04T16:40:45.427046589Z \n2026-11-04T16:40:45.427047964Z Success. You can now start the database server using:\n2026-11-04T16:40:45.427048505Z \n2026-11-04T16:40:45.427049005Z pg_ctl -D /var/lib/postgresql/data/pgdata -l logfile start\n2026-11-04T16:40:45.427040047Z initdb: warning: enabling \"trust\" authentication for local connections\n2026-11-04T16:40:45.427056214Z initdb: hint: You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb.\n2026-11-04T16:40:45.427049922Z \n2026-11-04T16:40:45.446506489Z waiting for server to start....2026-11-04 16:40:45.446 UTC [61] LOG: starting PostgreSQL 17.11 on aarch64-unknown-linux-musl, compiled by gcc (Alpine 15.2.0) 15.2.0, 64-bit\n2026-11-04T16:40:45.447122031Z 2026-11-04 16:40:45.447 UTC [61] LOG: listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n2026-11-04T16:40:45.448174449Z 2026-11-04 16:40:45.448 UTC [64] LOG: database system was shut down at 2026-11-04 16:40:45 UTC\n2026-11-04T16:40:45.449944118Z 2026-11-04 16:40:45.449 UTC [61] LOG: database system is ready to accept connections\n2026-11-04T16:40:45.539037399Z done\n2026-11-04T16:40:45.539057024Z server started\n2026-11-04T16:40:45.546291159Z \n2026-11-04T16:40:45.546310534Z /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*\n2026-11-04T16:40:45.546311450Z \n2026-11-04T16:40:45.546675451Z waiting for server to shut down....2026-11-04 16:40:45.546 UTC [61] LOG: received fast shutdown request\n2026-11-04T16:40:45.546682409Z 2026-11-04 16:40:45.546 UTC [61] LOG: aborting any active transactions","more":16},{"t":11.1,"kind":"run","cmd":"kubectl -n shop rollout history deployment/web","out":"deployment.apps/web \nREVISION CHANGE-CAUSE\n1 ","more":0},{"t":11.1,"kind":"run","cmd":"kubectl -n shop logs deployment/web --all-pods=true --tail=80 --timestamps","out":"[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.285153198Z /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.285172739Z /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.285681948Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.286612533Z 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-bsmw6/nginx] 2026-11-04T16:40:45.286779533Z /docker-entrypoint.sh: Sourcing /docker-entrypoint.d/15-local-resolvers.envsh\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.286781991Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.287993410Z /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.288960619Z /docker-entrypoint.sh: Configuration complete; ready for start up\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292713291Z 2026/11/04 16:40:45 [notice] 1#1: using the \"epoll\" event method\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292721666Z 2026/11/04 16:40:45 [notice] 1#1: nginx/1.29.8\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292722957Z 2026/11/04 16:40:45 [notice] 1#1: built by gcc 15.2.0 (Alpine 15.2.0) \n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292723582Z 2026/11/04 16:40:45 [notice] 1#1: OS: Linux 6.8.0-117-generic\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292724666Z 2026/11/04 16:40:45 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1073741816:1073741816\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292731916Z 2026/11/04 16:40:45 [notice] 1#1: start worker processes\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292810708Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 28\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292903083Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 29\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292923624Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 30\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.292985791Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 31\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.293050458Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 32\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.293165958Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 33\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.293293250Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 34\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.293383208Z 2026/11/04 16:40:45 [notice] 1#1: start worker process 35\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.368371888Z 2026/11/04 16:40:45 [error] 28#28: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 10.244.0.1, server: , request: \"GET /healthz HTTP/1.1\", upstream: \"http://10.96.76.76:8080/healthz\", host: \"10.244.0.154:80\"\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:45.368633430Z 10.244.0.1 - - [04/Nov/2026:16:40:45 +0000] \"GET /healthz HTTP/1.1\" 502 157 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:50.370723485Z 10.244.0.1 - - [04/Nov/2026:16:40:50 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:55.369353649Z 10.244.0.1 - - [04/Nov/2026:16:40:55 +0000] \"GET /healthz HTTP/1.1\" 200 12 \"-\" \"kube-probe/1.37\" \"-\"\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:55.520340514Z 10.244.0.155 - - [04/Nov/2026:16:40:55 +0000] \"GET /orders HTTP/1.1\" 200 36 \"-\" \"curl/8.17.0\" \"-\"\n[pod/web-86cc98785b-bsmw6/nginx] 2026-11-04T16:40:56.139635080Z 10.244.0.155 - - [04/Nov/2026:16:40:56 ","more":60},{"t":11.1,"kind":"run","cmd":"kubectl -n shop logs deployment/api --all-pods=true --tail=80 --timestamps","out":"[pod/api-7d87b9fcf5-bpfbz/api] 2026-11-04T16:40:45.280780025Z api listening on 8080, db=db:5432\n[pod/api-7d87b9fcf5-fhn48/api] 2026-11-04T16:40:45.263219003Z api listening on 8080, db=db:5432","more":0},{"t":14.1,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- curl -v --max-time 5 http://10.96.212.225/orders","out":" % Total % Received % Xferd Average Speed Time Time Time Current\n Dload Upload Total Spent Left Speed\n\r 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying 10.96.212.225:80...\n* Established connection to 10.96.212.225 (10.96.212.225 port 80) from 10.244.0.155 port 56484 \n* using HTTP/1.x\n> GET /orders HTTP/1.1\r\n> Host: 10.96.212.225\r\n> User-Agent: curl/8.17.0\r\n> Accept: */*\r\n> \r\n* Request completely sent off\n\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:02 --:--:-- 0\r\n504 Gateway Time-out\r\n\r\n

504 Gateway Time-out

\r\n
nginx/1.29.8
\r\n\r\n\r\n< HTTP/1.1 504 Gateway Time-out\r\n< Server: nginx/1.29.8\r\n< Date: Wed, 04 Nov 2026 16:42:15 GMT\r\n< Content-Type: text/html\r\n< Content-Length: 167\r\n< Connection: keep-alive\r\n< \r\n{ [167 bytes data]\n\r100 167 100 167 0 0 55 0 0:00:03 0:00:03 --:--:-- 55\r100 167 100 167 0 0 55 0 0:00:03 0:00:03 --:--:-- 55\n* Connection #0 to host 10.96.212.225:80 left intact","more":0},{"t":16.2,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- curl -v --max-time 5 http://web/orders","out":" % Total % Received % Xferd Average Speed Time Time Time Current\n Dload Upload Total Spent Left Speed\n\r 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:02 --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:03 --:--:-- 0\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:04 --:--:-- 0* Resolving timed out after 5000 milliseconds\n\r 0 0 0 0 0 0 0 0 --:--:-- 0:00:05 --:--:-- 0\n* closing connection #0\ncurl: (28) Resolving timed out after 5000 milliseconds\ncommand terminated with exit code 28","more":0},{"t":19.8,"kind":"say","text":"CoreDNS is scaled to zero and has no DNS endpoints; resolving `web` times out. A direct request to the web service also returned 504, consistent with downstream DNS dependency. I’m restoring CoreDNS capacity, which the runbook explicitly permits."},{"t":19.8,"kind":"run","cmd":"kubectl -n kube-system get events --field-selector involvedObject.name=coredns --sort-by=.lastTimestamp","out":"LAST SEEN TYPE REASON OBJECT MESSAGE\n2m44s Normal ScalingReplicaSet deployment/coredns Scaled up replica set coredns-58d49f4bd9 from 0 to 2\n80s Normal ScalingReplicaSet deployment/coredns Scaled down replica set coredns-58d49f4bd9 from 2 to 0","more":0},{"t":19.8,"kind":"run","cmd":"kubectl -n kube-system get hpa","out":"No resources found in kube-system namespace.","more":0},{"t":19.9,"kind":"run","cmd":"kubectl -n kube-system describe deployment coredns","out":"Name: coredns\nNamespace: kube-system\nCreationTimestamp: Tue, 03 Nov 2026 03:32:01 +0000\nLabels: k8s-app=kube-dns\nAnnotations: deployment.kubernetes.io/revision: 6\nSelector: k8s-app=kube-dns\nReplicas: 0 desired | 0 updated | 0 total | 0 available | 0 unavailable\nStrategyType: RollingUpdate\nMinReadySeconds: 0\nRollingUpdateStrategy: 1 max unavailable, 25% max surge\nPod Template:\n Labels: k8s-app=kube-dns\n Annotations: kubectl.kubernetes.io/restartedAt: 2026-11-03T23:23:09Z\n Service Account: coredns\n Containers:\n coredns:\n Image: registry.k8s.io/coredns/coredns:v1.14.6\n Ports: 53/UDP (dns), 53/TCP (dns-tcp), 9153/TCP (metrics), 8080/TCP (liveness-probe), 8181/TCP (readiness-probe)\n Host Ports: 0/UDP (dns), 0/TCP (dns-tcp), 0/TCP (metrics), 0/TCP (liveness-probe), 0/TCP (readiness-probe)\n Args:\n -conf\n /etc/coredns/Corefile\n Limits:\n memory: 170Mi\n Requests:\n cpu: 100m\n memory: 70Mi\n Liveness: http-get http://:liveness-probe/health delay=60s timeout=5s period=10s successThreshold=1 failureThreshold=5\n Readiness: http-get http://:readiness-probe/ready delay=0s timeout=1s period=10s successThreshold=1 failureThreshold=3\n Environment: \n Mounts:\n /etc/coredns from config-volume (ro)\n Volumes:\n config-volume:\n Type: ConfigMap (a volume populated by a ConfigMap)\n Name: coredns\n Optional: false\n Priority Class Name: system-cluster-critical\n Node-Selectors: kubernetes.io/os=linux\n Tolerations: CriticalAddonsOnly op=Exists","more":13},{"t":21.8,"kind":"run","cmd":"kubectl -n kube-system scale deployment/coredns --current-replicas=0 --replicas=2","out":"deployment.apps/coredns scaled","more":0},{"t":24.8,"kind":"run","cmd":"kubectl -n kube-system get endpoints kube-dns -o wide","out":"Warning: v1 Endpoints is deprecated in v1.33+; use discovery.k8s.io/v1 EndpointSlice\nNAME ENDPOINTS AGE\nkube-dns 10.244.0.156:9153,10.244.0.157:9153,10.244.0.156:53 + 3 more... 37h","more":0},{"t":24.8,"kind":"run","cmd":"kubectl -n shop logs deployment/synthetic --tail=30 --timestamps","out":"2026-11-04T16:40:46.319202113Z 2026-11-04T16:40:46Z GET /orders 000\n2026-11-04T16:40:48.327592833Z 2026-11-04T16:40:48Z GET /orders 000\n2026-11-04T16:40:50.332595102Z 2026-11-04T16:40:50Z GET /orders 000\n2026-11-04T16:40:52.338702134Z 2026-11-04T16:40:52Z GET /orders 200\n2026-11-04T16:40:54.345884263Z 2026-11-04T16:40:54Z GET /orders 200\n2026-11-04T16:40:56.351756484Z 2026-11-04T16:40:56Z GET /orders 200\n2026-11-04T16:40:58.358583427Z 2026-11-04T16:40:58Z GET /orders 200\n2026-11-04T16:41:00.366160133Z 2026-11-04T16:41:00Z GET /orders 200\n2026-11-04T16:41:02.376842729Z 2026-11-04T16:41:02Z GET /orders 200\n2026-11-04T16:41:04.396278515Z 2026-11-04T16:41:04Z GET /orders 200\n2026-11-04T16:41:06.401900794Z 2026-11-04T16:41:06Z GET /orders 200\n2026-11-04T16:41:12.412077814Z 2026-11-04T16:41:12Z GET /orders 000\n2026-11-04T16:41:18.424888021Z 2026-11-04T16:41:18Z GET /orders 000\n2026-11-04T16:41:24.435822492Z 2026-11-04T16:41:24Z GET /orders 000\n2026-11-04T16:41:30.447715187Z 2026-11-04T16:41:30Z GET /orders 000\n2026-11-04T16:41:36.462764984Z 2026-11-04T16:41:36Z GET /orders 000\n2026-11-04T16:41:42.472844036Z 2026-11-04T16:41:42Z GET /orders 000\n2026-11-04T16:41:48.480389137Z 2026-11-04T16:41:48Z GET /orders 000\n2026-11-04T16:41:54.496583970Z 2026-11-04T16:41:54Z GET /orders 000\n2026-11-04T16:42:00.511185102Z 2026-11-04T16:42:00Z GET /orders 000\n2026-11-04T16:42:06.524993532Z 2026-11-04T16:42:06Z GET /orders 000\n2026-11-04T16:42:12.538179009Z 2026-11-04T16:42:12Z GET /orders 000\n2026-11-04T16:42:18.551408493Z 2026-11-04T16:42:18Z GET /orders 000\n2026-11-04T16:42:24.587399559Z 2026-11-04T16:42:24Z GET /orders 000\n2026-11-04T16:42:26.607851030Z 2026-11-04T16:42:26Z GET /orders 200","more":0},{"t":24.9,"kind":"run","cmd":"kubectl -n kube-system rollout status deployment/coredns --timeout=60s","out":"deployment \"coredns\" successfully rolled out","more":0},{"t":29.2,"kind":"say","text":"CoreDNS is back at two ready replicas, and the synthetic probe has returned its first 200 at 16:42:26 UTC. I’m checking that DNS and `/orders` continue to work after the change."},{"t":29.3,"kind":"run","cmd":"kubectl -n kube-system get deployment coredns -o wide","out":"NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR\ncoredns 2/2 2 2 37h coredns registry.k8s.io/coredns/coredns:v1.14.6 k8s-app=kube-dns","more":0},{"t":29.3,"kind":"run","cmd":"kubectl -n shop get pods -o wide","out":"NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES\napi-7d87b9fcf5-bpfbz 1/1 Running 0 107s 10.244.0.151 oncall-lab-control-plane \napi-7d87b9fcf5-fhn48 1/1 Running 0 107s 10.244.0.150 oncall-lab-control-plane \ndb-5c45bf6fd6-cqcjz 1/1 Running 0 107s 10.244.0.149 oncall-lab-control-plane \nsynthetic-5cc5f987df-6mckc 1/1 Running 0 107s 10.244.0.155 oncall-lab-control-plane \nweb-86cc98785b-bsmw6 1/1 Running 0 107s 10.244.0.154 oncall-lab-control-plane \nweb-86cc98785b-flvc4 1/1 Running 0 107s 10.244.0.153 oncall-lab-control-plane \nworker-85767c58ff-sg5wn 1/1 Running 0 107s 10.244.0.152 oncall-lab-control-plane ","more":0},{"t":29.3,"kind":"run","cmd":"kubectl -n shop logs deploy/synthetic --since=30s --timestamps","out":"2026-11-04T16:42:06.524993532Z 2026-11-04T16:42:06Z GET /orders 000\n2026-11-04T16:42:12.538179009Z 2026-11-04T16:42:12Z GET /orders 000\n2026-11-04T16:42:18.551408493Z 2026-11-04T16:42:18Z GET /orders 000\n2026-11-04T16:42:24.587399559Z 2026-11-04T16:42:24Z GET /orders 000\n2026-11-04T16:42:26.607851030Z 2026-11-04T16:42:26Z GET /orders 200\n2026-11-04T16:42:28.613600864Z 2026-11-04T16:42:28Z GET /orders 200\n2026-11-04T16:42:30.621879544Z 2026-11-04T16:42:30Z GET /orders 200","more":0},{"t":29.3,"kind":"run","cmd":"kubectl -n kube-system logs deployment/coredns --all-pods=true --tail=20 --timestamps","out":"[pod/coredns-58d49f4bd9-7wmtg/coredns] 2026-11-04T16:42:24.119196208Z maxprocs: Leaving GOMAXPROCS=8: CPU quota undefined\n[pod/coredns-58d49f4bd9-7wmtg/coredns] 2026-11-04T16:42:24.220737866Z .:53\n[pod/coredns-58d49f4bd9-7wmtg/coredns] 2026-11-04T16:42:24.220794657Z [INFO] plugin/reload: Running configuration SHA512 = 1b226df79860026c6a52e67daa10d7f0d57ec5b023288ec00c5e05f93523c894564e15b91770d3a07ae1cfbe861d15b37d4a0027e69c546ab112970993a3b03b\n[pod/coredns-58d49f4bd9-7wmtg/coredns] 2026-11-04T16:42:24.220800532Z CoreDNS-1.14.6\n[pod/coredns-58d49f4bd9-7wmtg/coredns] 2026-11-04T16:42:24.220801907Z linux/arm64, go1.26.5, 424d125\n[pod/coredns-58d49f4bd9-x57m2/coredns] 2026-11-04T16:42:24.117853873Z maxprocs: Leaving GOMAXPROCS=8: CPU quota undefined\n[pod/coredns-58d49f4bd9-x57m2/coredns] 2026-11-04T16:42:24.219306322Z .:53\n[pod/coredns-58d49f4bd9-x57m2/coredns] 2026-11-04T16:42:24.219393530Z [INFO] plugin/reload: Running configuration SHA512 = 1b226df79860026c6a52e67daa10d7f0d57ec5b023288ec00c5e05f93523c894564e15b91770d3a07ae1cfbe861d15b37d4a0027e69c546ab112970993a3b03b\n[pod/coredns-58d49f4bd9-x57m2/coredns] 2026-11-04T16:42:24.219402030Z CoreDNS-1.14.6\n[pod/coredns-58d49f4bd9-x57m2/coredns] 2026-11-04T16:42:24.219403239Z linux/arm64, go1.26.5, 424d125","more":0},{"t":29.3,"kind":"run","cmd":"kubectl -n shop exec deploy/synthetic -- curl -sS -i --max-time 8 http://web/orders","out":"HTTP/1.1 200 OK\r\nServer: nginx/1.29.8\r\nDate: Wed, 04 Nov 2026 16:42:31 GMT\r\nContent-Type: application/json\r\nContent-Length: 36\r\nConnection: keep-alive\r\n\r\n{\"orders\": [{\"id\": 1, \"total\": 42}]}","more":0}],"report":"IMPACT: `/orders` probes failed from 16:41:12 to 16:42:24 UTC. Clients relying on cluster DNS were affected; a direct request to the web service also returned 504.\n\nROOT CAUSE: `Deployment/kube-system/coredns` had `spec.replicas: 0`, leaving the DNS service without endpoints. Why it was scaled down is unknown.\n\nACTIONS TAKEN: Scaled CoreDNS from zero to two replicas.\n\nSTATUS: **Mitigated.** CoreDNS is 2/2 ready, DNS endpoints are present, and consecutive synthetic probes returned 200 starting at 16:42:26 UTC. A separate request to `http://web/orders` also returned 200. Longer-term stability and alert clearance have not yet been verified.\n\nESCALATION: none.\n\nFOLLOW-UP: Investigate what scaled CoreDNS to zero and prevent a recurrence."}