Three display defects surfaced when rendering the live PS/pump/MGC dashboards:
1. Doubled values everywhere. EVOLV telemetry historically carried stray tags
(tagcode="undefined"/uuid="null") that newer writes dropped, so InfluxDB holds
two series per field and last() returned two of everything (e.g. Time Left,
Runtime, Heights). Add |> group(columns:["_field"]) before last()/aggregateWindow
in every template query so each field collapses to one value/line regardless of
tag-set history.
2. fields:"/.*/" also rendered the _time column as a stat value. For single-field
string panels (Direction, Flow Source, Mode, State, Prediction Quality) append
|> keep(columns:["_value"]); for mixed string+numeric panels (valve/vgc/monster)
drop _time/_start/_stop instead.
3. Level/Heights showed "0.12 min" — Grafana unit id "m" means minutes, not meters.
Change to lengthm; normalize m³->m3, m³/h->m3/h on pumpingStation.
Verified live via headless screenshots: PS, pump, and measurement dashboards now
show single clean values with correct units.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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