Incident Library

API · MCP 한국어

API and MCP kubegap Corrections and proposals

Incident Library

API · MCP 한국어

Contributing factor

No health probes

헬스 프로브 부재 · no-health-probe

4 cases · 2018 to 2025

Root cause Configuration change2 Software defect2

Component kubelet3 Admission webhook1 In-memory cache1 GKE control plane1 Kubernetes API server1

Symptom Node NotReady2 Service outage2 Upgrade stall2 Control plane unresponsive1

Organisation AdGuard VPN1 DFDS1 Jetstack1 Oath1

Cases

IL-0063 VPN outage after recreating a Redis StatefulSet restarted the whole Redis cluster without readiness checksAdGuard VPN · 2025
Root cause Configuration change
IL-0112 The daily node rollover put DFDS's EKS nodes on an AMI later recalled for a kernel issue, causing "PLEG is not healthy" NodeNotReady flaps and pod network timeoutsDFDS · 2022
Root cause Software defect
IL-0008 An unresponsive OPA validating webhook crash-looped the API server during a GKE master upgrade, and node auto-repair then recreated every node

View on the graph

Kubernetes controller manager1

Node launch template1

Container memory limit1

Node operating system image1

Persistent volumes and stateful sets1

Intermittent connection failures1

Intermittent timeouts1

Node recreation loop1

Probe failures1

Jetstack · 2019

Root cause Configuration change

IL-0038 kubelet rollout hit a Kubernetes bug and left every node in a cluster NotReady, triggering mass pod evictionOath · 2018

Root cause Software defect