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6911963939
The per-panel legend used legendFormat "__auto" reshaped by an 11-rule
renameByRegex chain. __auto sorts labels alphabetically and cannot group,
so the chain existed only to bolt grouping onto its output -- unmaintainable
and non-compliant with the dashboard legend guideline.
Build the grouped labels once at ingestion instead. A new transform/legendgroups
processor derives two resource attributes, promoted to Prometheus labels by
resource_to_telemetry_conversion:
- resource_group: service_instance_id[-xrpl_network_type]
- iac_group: xrpl_branch-xrpl_node_role-xrpl_work_item (perf runs only)
Each is left unset when its sources are absent, so Prometheus drops the empty
label and the legend shows nothing for it. Concat is presence-guarded because
OTTL Concat renders "<nil>" for an absent attribute.
Dashboards now use a Standard-option Display name that references the pre-built
labels (${__field.labels.series} [resource_group] [iac_group]); ${__field.labels.X}
renders empty for a missing label, so absent groups vanish. A single generic
renameByRegex strips the resulting empty "[]" bracket. legendFormat is dropped
(Display name supersedes it). Tooltip maxHeight set to 600 per guideline.
Applied here to the three dashboards this branch introduced (ledger-data-sync,
network-traffic, overlay-traffic-detail); value-mapping renameByRegex rules are
preserved. Verified end-to-end on a live local stack (collector -> Prometheus ->
Grafana): perf and dev nodes render correct, clutter-free legends.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>