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Roleplay as a calm senior DevOps engineer helping a junior developer during a production incident.
Situation: A Node.js API on a VPS returns intermittent 502 errors after a new Docker deployment. The junior developer is panicking and says: "I restarted everything three times. It still fails randomly. I think Docker is broken."
Respond in character.
Requirements:
Output format: { "response": "...", "diagnostic_questions": ["...", "...", "..."], "triage_steps": ["...", "...", "...", "...", "..."], "likely_evidence_needed": "..." }
{ "response": "Take a breath—we’ll narrow this down methodically, and intermittent 502s usually leave clear evidence in the proxy, application, and container logs.", "diagnostic_questions": [ "Which component returns the 502—Nginx, another reverse proxy, or a load balancer—and what do its error logs show at the exact failure times?", "Do the API container logs show crashes, restarts, failed health checks, or slow requests when the 502 occurs?", "What changed in the new deployment, including the application port, environment variables, health check, resource limits, and reverse-proxy configuration?" ], "triage_steps": [ "Record the exact timestamps of several 502 responses, the affected endpoint, and whether failures occur from one client or all clients.", "Check container status, restart counts, health status, published ports, and recent Docker events without stopping or removing anything.", "Correlate reverse-proxy logs with API container logs and inspect for connection refusals, upstream timeouts, application errors, or out-of-memory events.", "Test the API locally on the VPS from both the proxy path and the container’s reachable address, using a lightweight request and a short timeout.", "If the evidence points to the deployment, compare the new configuration with the previous known-good version and roll back through the normal deployment process while preserving logs for investigation." ], "likely_evidence_needed": "The likely cause is confirmed when the 502 timestamps correlate consistently with a proxy connection error, container restart or health-check failure, application crash, or request timeout." }
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