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- Refactor specialized docs for conciseness and clarity - Rename files to UPPER_CASE.md convention - Verify accuracy against codebase - Fix broken links
36 lines
1.5 KiB
Markdown
36 lines
1.5 KiB
Markdown
# 📊 Prometheus Metrics
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Pulse exposes metrics at `/metrics` (default port `9091`).
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## 🌐 HTTP Ingress
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| Metric | Type | Description |
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| :--- | :--- | :--- |
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| `pulse_http_request_duration_seconds` | Histogram | Latency buckets by `method`, `route`, `status`. |
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| `pulse_http_requests_total` | Counter | Total requests. |
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| `pulse_http_request_errors_total` | Counter | 4xx/5xx errors. |
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## 🔄 Polling & Nodes
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| Metric | Type | Description |
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| :--- | :--- | :--- |
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| `pulse_monitor_node_poll_duration_seconds` | Histogram | Per-node poll latency. |
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| `pulse_monitor_node_poll_total` | Counter | Success/error counts per node. |
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| `pulse_monitor_node_poll_staleness_seconds` | Gauge | Seconds since last success. |
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| `pulse_monitor_poll_queue_depth` | Gauge | Global queue depth. |
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## 🧠 Scheduler Health
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| Metric | Type | Description |
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| :--- | :--- | :--- |
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| `pulse_scheduler_queue_depth` | Gauge | Queue depth per instance type. |
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| `pulse_scheduler_dead_letter_depth` | Gauge | DLQ depth per instance. |
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| `pulse_scheduler_breaker_state` | Gauge | `0`=Closed, `1`=Half-Open, `2`=Open. |
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## ⚡ Diagnostics Cache
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| Metric | Type | Description |
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| :--- | :--- | :--- |
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| `pulse_diagnostics_cache_hits_total` | Counter | Cache hits. |
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| `pulse_diagnostics_refresh_duration_seconds` | Histogram | Refresh latency. |
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## 🚨 Alerting Examples
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* **High Error Rate**: `rate(pulse_http_request_errors_total[5m]) > 0.05`
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* **Stale Node**: `pulse_monitor_node_poll_staleness_seconds > 300`
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* **Breaker Open**: `pulse_scheduler_breaker_state == 2`
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