schemeta/docs/operations-runbook.md

Schemeta Operations Runbook

This runbook covers baseline production operation for Schemeta API + UI.

Runtime

• Node.js 18+ recommended.
• Start command: npm run start
• Default bind: 0.0.0.0:8787

Environment Variables

• PORT (default 8787)
• MAX_BODY_BYTES (default 2097152)
  • Hard limit for request body size on POST endpoints.
• MAX_REQUESTS_PER_MINUTE (default 120)
  • Per-client IP rate limit window for POST endpoints.
• CORS_ORIGIN (optional)
  • If set, CORS is enabled for this origin only.

Endpoints

• GET /health
  • Liveness probe, returns process uptime and status.
• GET /
  • Serves workspace UI.
• POST /compile
  • Compile + render with ERC/diagnostics and layout metrics.
• POST /analyze
  • Topology and diagnostics summary.
• GET /mcp/ui-bundle
  • Metadata for MCP UI embedding.

Production Checks

1. Verify process liveness:
   • curl -s http://localhost:${PORT:-8787}/health
2. Verify compile endpoint:
   • post frontend/sample.schemeta.json to /compile.
3. Verify analyze endpoint:
   • post same sample to /analyze.
4. Verify rate limiting:
   • exceed MAX_REQUESTS_PER_MINUTE with repeated POST and confirm 429.

Incident Playbook

High error rate (5xx)

1. Check process logs for stack traces and malformed payload spikes.
2. Validate request body sizes; lower/raise MAX_BODY_BYTES as appropriate.
3. Reproduce with frontend/sample.schemeta.json to isolate model-driven payload issues.
4. Roll back to previous known-good tag if regression confirmed.

Elevated 429 responses

1. Confirm traffic source and whether bursts are expected.
2. If trusted internal clients are throttled, tune MAX_REQUESTS_PER_MINUTE.
3. Consider fronting with reverse proxy rate limit tiers for external users.

UI/compile mismatch reports

1. Capture JSON from user (Copy Repro in workspace).
2. Re-run through /compile and inspect warnings, errors, and layout_metrics.
3. Compare with last release baseline for crossing/overlap regressions.

Release / Rollback

1. Follow docs/release-checklist.md.
2. Tag releases after checklist completion and test pass.
3. Keep previous stable tag ready for fast rollback.

Observability Recommendations

• Add structured request logs at reverse proxy layer.
• Track latency percentiles for /compile and /analyze.
• Track per-endpoint status code rates and top warning/error IDs.