The template variable queried label_values(node_uname_info, host), but no
node-exporter metric in this Prometheus carries a 'host' label (that label
only exists on blackbox-probe metrics). The variable resolved to empty and
all five panels rendered blank.
- Replace $host with a visible $node variable (nodename: k8s-1/2/3) plus a
hidden chained $instance variable (nodename -> instance via node_uname_info)
- Filter Cilium pod interfaces (lxc*, cilium_*) and always-zero kernel
pseudo-devices (ip6tnl0, sit0, teql0, tunl0) out of Network I/O
- Filter Ceph RBD-mapped volumes (rbd0..11) out of Disk I/O so the panel
shows physical disks (nvme0n1, vda) only
- Exclude the rootfs bind mount (/etc/extensions.yaml) from Filesystem
Usage, leaving the meaningful /var xfs mount
All queries verified against live Prometheus before commit.
claude-bot