43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
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### CHELSTY Stability Agent
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The stability-agent on CHELSTY provides local observability and health monitoring for the node's services and infrastructure.
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#### Purpose
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It acts as a filesystem-first watchdog that detects anomalies in the local runtime environment without taking autonomous destructive actions (like restarts). It serves as the primary data source for node-level stability metrics.
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#### Monitoring Scope
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* **Docker Containers**: Monitors all local containers. If a container is not in the `running` state, a `containers_not_running` event is generated.
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* **Disk Usage**: Monitors the root filesystem. Generates `disk_usage_high` events if usage exceeds the configured threshold.
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* **Connectivity**:
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* Checks if the Tailscale socket or interface is available.
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* Checks reachability of the local Mosquitto MQTT broker.
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* **Zigbee2MQTT**: Specifically tracks the presence and status of the Zigbee2MQTT service.
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#### Storage and Integration
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* **Heartbeat**: Updated every cycle at `/opt/homelab/state/stability-agent.heartbeat`.
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* **State Summary**: A JSON summary of all latest checks at `/opt/homelab/state/stability-agent.json`.
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* **Events**: Append-only JSON lines at `/opt/homelab/events/YYYY-MM-DD/chelsty/events.jsonl`.
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#### Deployment
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The service is deployed via Docker Compose on CHELSTY.
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```bash
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cd services/stability-agent
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docker compose up -d
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```
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#### Configuration
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Configuration is managed via environment variables in `docker-compose.override.yml` on the host.
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| Variable | Description | Default |
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|----------|-------------|---------|
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| `STABILITY_CHECK_INTERVAL` | Seconds between checks | `60` |
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| `DISK_THRESHOLD_PCT` | Disk usage alert threshold | `90` |
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| `MQTT_HOST` | MQTT broker hostname | `mosquitto` |
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| `MQTT_PORT` | MQTT broker port | `1883` |
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