A CPU/RAM/Disk history graph over selectable ranges (1h/24h/7d/30d) on the server
detail page, backed by a persisted time series (the live 15s view stays cache-only).
- metric_samples table (server_id cascade, cpu/mem/disk %, load, sampled_at indexed).
- clusev:sample-metrics (scheduled every minute, mirrors clusev:wg-sample): persists
one row per server from the cached live reading, prunes beyond --retention (30d).
- MetricHistory::series() buckets + averages samples for a window; empty buckets stay
null so the chart shows gaps, not fabricated values.
- Servers/Show: range selector + a gap-aware SVG line chart (theme-token strokes,
R3-compliant, mirrors the dashboard chart). historyRange is clamped via setRange()
and the updatedHistoryRange() hook (it's a public, client-settable property).
Codex review: fixed a right-edge bucket off-by-one, clamped percentages on write, and
guarded the public range property against direct client values. Browser-verified: the
chart renders with data, range buttons, legend and gaps, zero console errors. 447
tests green, pint clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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