K8s Sentinel — Generative Incident Cockpit

Pod Fleet Topology & Status

kubernetes-mcp-server • port 9236

payments-api-5fcf89c9cc-ghh7m 0/1 CrashLoop

Restarts: 2 (14s ago)

Exit Code: 1 (Error)

Reason: CrashLoopBackOff

payments-api-76bfc8b48c-cv5n8 1/1 Running

Restarts: 0

Exit Code: 0

Reason: Active Replica

payments-api-76bfc8b48c-mr8fz 1/1 Running

Restarts: 0

Exit Code: 0

Reason: Active Replica

Root Cause Smoking Gun (Isolated by Sentinel)

ConfigMap / demo / nginx-healthz

Daytona remote sandbox parsed previous container logs and extracted the exact directive crash. Nginx failed initialization on container boot due to an unrecognized configuration token:

❌ LIVE BROKEN CONFIG default.conf

server {
    listen 80;

    this_directive_does_not_exist 42;

    location = /healthz {
        return 200 "ok\n";
    }
}

↳ nginx: [emerg] unknown directive "this_directive_does_not_exist" in /etc/nginx/conf.d/default.conf:3

✓ SENTINEL SYNTHESIZED FIX remediation.patch

server {
    listen 80;

    # Invalid directive removed

    location = /healthz {
        return 200 "ok\n";
    }
}

↳ HTTP /healthz probe returns 200 OK; container passes readiness probes

SQLite Cross-Session Persistence Engine

db.sqlite

Operator: "In one sentence, what was the exact root cause of the incident we just investigated?"

Sentinel: "The payments-api pods were crash-looping because the nginx-healthz ConfigMap contained invalid directive 'this_directive_does_not_exist 42;' in /etc/nginx/conf.d/default.conf:3, causing startup exit."

Reconstructed directly from TrueForge thread_context_log • Zero cluster queries executed

Approval Gate

mutating: true

TrueForge runtime has paused execution. In accordance with SRE safety policy, mutating operations require operator approval:

# Command 1: Patch ConfigMap

kubectl patch configmap nginx-healthz -n demo --type merge -p '{"data":{"default.conf":"server { listen 80; location = /healthz { return 200 \\"ok\\\\n\\"; } }"}}'

# Command 2: Trigger Rollout

kubectl rollout restart deployment/payments-api -n demo