Replace merge transformation with joinByField on instance — the merge
couldn't combine rows from queries with different label cardinality
(node_uname_info has many extra labels), producing 7 rows instead of 3.
Fix boot time showing "56 years ago" by multiplying node_boot_time_seconds
by 1000 — Grafana's dateTimeFromNow unit expects epoch milliseconds.
Also hide the exported_nodename column (container hostname, not useful).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The incus scrape job (/1.0/metrics) exports both incus_* and node_* metrics,
duplicating the dedicated node-exporter containers. This caused 6 "nodes"
instead of 3 in dashboards, with the incus-sourced entries showing container
artifacts (epoch-0 boot time, 128 MiB RAM).
Prometheus config changes:
- Drop node_* metrics from incus job via metric_relabel_configs
- Relabel node-exporter instances to friendly names (oc-node-01/02/03)
using per-target nodename labels + relabel_configs
Dashboard changes (belt-and-suspenders):
- Add job="node-exporter" to all template variables and panel queries
in host-resources, network-deep-dive, storage-filesystem, capacity-planning
- Add Logs Drilldown link to logs-explorer dashboard
- Add Promtail journal relabels for level and service_name
Also: install Logs Drilldown plugin, update observability guide with
Logs Drilldown documentation and screenshots.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Maarten