ha-sofia's 7 R730 REST sensors (CPU/exhaust/inlet temp, power, 2x PSU voltage,
fan) read the iDRAC via the slow on-demand Redfish exporter (scan_interval 120,
~16-22s/fetch, intermittent `unavailable` blips). Migrated them to a FAST
Prometheus query of the SNMP values (instant, ~1m-fresh from the snmp-idrac
scrape), scan_interval 30.
This adds the enabling ingress: `prometheus-query.viktorbarzin.lan` →
`prometheus-server:80`, auth=none, allow_local_access_only, path-scoped to
`/api/v1/query` (read-only instant-query only — not the UI/admin/federation).
ha-sofia can't use `prometheus.viktorbarzin.me` (Authentik-gated, no OIDC from
a REST sensor), so this mirrors the existing local-only `.lan` exporter
ingresses HA already queries.
The ha-sofia REST file (`/config/rest_resources/idrac_redfish_exporter.yaml`)
was edited in place (auto-version-controlled by the HA version-control add-on;
pre-migration copy at `/config/idrac_redfish_exporter.bak-pre-snmp`). The
Technitium CNAME `prometheus-query.viktorbarzin.lan -> ingress.viktorbarzin.lan`
was added manually via the API — like the other `.lan` exporter hosts it is NOT
auto-synced (the technitium-ingress-dns-sync CronJob only creates `.me`
records). Follow-up (already noted for the Loki sensor): extend that sync to
manage `.lan` CNAMEs too. The Redfish remnant's `sensors` collector is now
vestigial (HA no longer reads it).
Verified: all 7 HA sensors report correct fresh values from Prometheus (fan
10800 rpm, CPU 62.0C, power 280W, PSU 230/240V).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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