Two fixes for the Grafana chart widget:
1. Invisible lines: the CHART_COLORS used 'hsl(var(--chart-1))' but the
CSS variable is named '--color-chart-1' and already contains a hex
color (#4f8cff). The hsl() wrapper produced invalid CSS, making
every stroke invisible. Fixed to var(--color-chart-1).
2. Multiple series collision: the backend labeled all Prometheus series
with the value field name (often just 'Value'), so multiple time
series collided on the same recharts dataKey and overwrote each
other. Now extracts meaningful labels from the Grafana frame metadata:
prefers displayName, then Prometheus metric labels (e.g.
'instance=server1:9100 mode=iowait'), then falls back to the field
name. Duplicate labels get a numeric suffix for uniqueness.
Multi-series queries now render correctly: each Prometheus time series
gets its own colored line with a unique label in the legend/tooltip.
280 backend tests pass (+1 labels test); 127 frontend tests pass; ruff/
eslint clean.
The iframe-based 'panel' widget didn't work: the browser couldn't
authenticate against the OIDC-protected Grafana (Authentik), and
iframes can't carry Bearer tokens or share cross-origin session
cookies. Result: blank iframe or login redirect.
Replace it with a 'chart' widget that queries Grafana's datasource
API server-side:
Backend (GrafanaWidgetSource): POSTs to /api/ds/query with the stored
api_key (which bypasses OIDC), using the widget's configured PromQL
query, datasource_uid, time range, and resolution. Normalizes Grafana's
frame-based response into a simple {series: [{label, points: [{t, v}]}]}
shape. The api_key is never exposed to the browser.
Frontend (GrafanaChartWidget): renders the series data as a recharts
LineChart with dark-mode-aware colors (Tailwind --chart-* tokens),
responsive container, custom tooltip, and per-series lines. Loading
skeleton, error Alert, and empty state. recharts ^3.9.2 added.
The 'link' widget kind (deep-link URL) is unchanged. The 'panel' kind
and GrafanaPanelWidget are fully removed.
Backend: 279 tests pass (+1 net: -2 panel + 3 chart). Frontend: 127
tests pass (net 0: -3 panel + 3 chart). Lint/build green both sides.
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