feat(infra): external monitoring stack (Beszel + Prometheus/Grafana)

Homelab monitoring design (docs/specs/2026-10-03-external-monitoring.md):
Beszel agents own the two physical hosts, prometheus-pve-exporter covers
every LXC/VM via the PVE API with no guest agents, and Grafana supplies
graphs. Dash needs zero code changes — JSON-path widgets already carry an
Authorization header and can walk Prometheus/Beszel JSON, embed widgets
iframe Grafana panels, and monitors + notification transports provide
the alerting layer for unmanaged hardware like the CM834 switch.

infra/monitoring/ ships compose.yaml, prometheus.yml, pve.yml.example
(gitignored real file), and Grafana datasource provisioning.
docs/monitoring.md documents deployment and widget recipes.

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Tomas DvorakandDevin committed 2026-10-03 10:36:27 +02:00
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@@ -6,6 +6,14 @@ All notable changes to Dash. Format follows
## [Unreleased]
### Added
- External monitoring stack `infra/monitoring/` (Prometheus + Grafana +
prometheus-pve-exporter + Beszel hub) with a `docs/monitoring.md` guide:
Beszel agents cover the physical hosts, pve-exporter covers all LXCs/VMs
via the PVE API, and existing JSON-path/embed widgets plus monitors
consume the data — no app code required
## [2.1.0] — 2026-09-23
### Added