deytenit
477c0eb5d1
node_exporter's uname collector reports the container's UTS hostname as
node_uname_info{nodename}, which Docker defaults to the container id. Grafana
surfaces that as the host, so every node showed a hex id instead of its name.
Setting hostname on the alloy service makes nodename the node's public host.
node/instance labels were already correct via the config.alloy relabel.