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pulse/docs/monitoring/PROMETHEUS_METRICS.md
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courtmanr@gmail.com fd39196166 refactor: finalize documentation overhaul 
- Refactor specialized docs for conciseness and clarity
- Rename files to UPPER_CASE.md convention
- Verify accuracy against codebase
- Fix broken links
2025-11-25 00:45:20 +00:00

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📊 Prometheus Metrics

Pulse exposes metrics at /metrics (default port 9091).

🌐 HTTP Ingress

Metric Type Description
pulse_http_request_duration_seconds Histogram Latency buckets by method, route, status.
pulse_http_requests_total Counter Total requests.
pulse_http_request_errors_total Counter 4xx/5xx errors.

🔄 Polling & Nodes

Metric Type Description
pulse_monitor_node_poll_duration_seconds Histogram Per-node poll latency.
pulse_monitor_node_poll_total Counter Success/error counts per node.
pulse_monitor_node_poll_staleness_seconds Gauge Seconds since last success.
pulse_monitor_poll_queue_depth Gauge Global queue depth.

🧠 Scheduler Health

Metric Type Description
pulse_scheduler_queue_depth Gauge Queue depth per instance type.
pulse_scheduler_dead_letter_depth Gauge DLQ depth per instance.
pulse_scheduler_breaker_state Gauge 0=Closed, 1=Half-Open, 2=Open.

⚡ Diagnostics Cache

Metric Type Description
pulse_diagnostics_cache_hits_total Counter Cache hits.
pulse_diagnostics_refresh_duration_seconds Histogram Refresh latency.

🚨 Alerting Examples

  • High Error Rate: rate(pulse_http_request_errors_total[5m]) > 0.05
  • Stale Node: pulse_monitor_node_poll_staleness_seconds > 300
  • Breaker Open: pulse_scheduler_breaker_state == 2
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