dankclaw/observability/quadlet/prometheus.container

@@ -43,14 +43,16 @@ Wants=network-online.target
 
 [Container]
 ContainerName=prometheus
-Image=docker.io/prom/prometheus:latest
+Image=docker.io/prom/prometheus:latest@sha256:fa3302279710be2f21a8301ec17a8b4f2301fd829bd113839b3b6b02b6f191a2
 Network=dankclaw_default
-# Name the podman gateway so scrape jobs can reach same-host targets (the
-# netavark hairpin gap bars this container from dialing its own host's LAN
-# IP; the cadvisor/gpu jobs and the blackbox scrape all ride this name).
-# Same mechanism the hermes Caddy upstream learned the hard way (Container
-# Host Reachability in the vault).
-HostAddr=host.containers.internal=169.254.1.2
+# Same-host scrape targets are dialed at host.containers.internal (the podman
+# gateway): a bridge container cannot dial its own host's LAN IP (netavark
+# hairpin gap, measured 2026-10-21), and traffic to the gateway lands on host
+# loopback / published ports (cadvisor/gpu jobs and the blackbox scrape all
+# ride it). The name resolves natively — NO HostAddr key: quadlet 5.7.0 calls
+# it unsupported and the WHOLE user quadlet batch then fails to generate,
+# silently orphaning every other unit (live 2026-10-21: prometheus.service
+# vanished while its container kept running as an orphan).
 User=0:0
 Exec=--config.file=/etc/prometheus/prometheus.yml --storage.tsdb.path=/prometheus --storage.tsdb.retention.time=30d --web.enable-lifecycle
 PublishPort=127.0.0.1:9090:9090