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portainer.md: add Observability section (Prometheus + Grafana)

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Prometheus scrapes /api/metrics via X-API-Key, alert rules for
environment health, Grafana dashboard at uid=portainer-be.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Florian Krebs
2026-05-26 17:23:09 +02:00
parent f65ceef90a
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@@ -119,6 +119,26 @@ docker logs portainer -f
python3 /usr/local/sbin/portainer-backup.py
```
## Observability
Portainer metrics scraped by Prometheus on CT 109 at `/api/metrics`.
- **Auth**: `X-API-Key: ptr_tJhUVPuut6wreG6yTkuRZcfM0Rlu8Jehbx7+LHG4unc=` (prometheus-scrape API token, user fkrebs)
- **Prometheus job**: `portainer` in `/opt/stacks/monitoring/prometheus/prometheus.yml`
- **Grafana dashboard**: `http://192.168.1.8:3000/d/portainer-be/portainer-be`
- Environment count, health status table, CPU/memory per environment, auth attempt rate
- **Alert rules**: `/opt/stacks/monitoring/prometheus/rules/portainer.yml`
- `PortainerEnvironmentUnhealthy` — env status == 2 for >2m → warning
- `PortainerDown` — scrape target unreachable for >1m → critical
Key metrics:
| Metric | Description |
|---|---|
| `portainer_environment_count` | Total environments by type (docker/k8s/swarm) |
| `portainer_environment_status` | 1=healthy, 2=unhealthy per environment |
| `portainer_environment_resource_usage` | CPU/memory % per environment |
| `portainer_authentication_total_status` | Auth success/fail counters |
## Arcane decommission (2026-05-26)
Arcane was replaced by Portainer on 2026-05-26: