Torjus Håkestad 7d291f85bf monitoring: propagate host labels to Prometheus scrape targets ...

Extract homelab.host metadata (tier, priority, role, labels) from host
configurations and propagate them to Prometheus scrape targets. This
enables semantic alert filtering using labels instead of hardcoded
instance names.

Changes:
- lib/monitoring.nix: Extract host metadata, group targets by labels
- prometheus.nix: Use structured static_configs with labels
- rules.yml: Replace instance filters with role-based filters

Example labels in Prometheus:
- ns1/ns2: role=dns, dns_role=primary/secondary
- nix-cache01: role=build-host
- testvm*: tier=test

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-07 17:04:50 +01:00

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