Relative-to-peak scaling reads a sparkline's shape well but is jumpy: the plain
window maximum lurches whenever the busiest bucket enters or ages out, and a lone
packet in a quiet window fills the column because it *is* the max. Add
`activity_peak`, a pure function that folds three dampers into one ceiling, each on
a different axis:
- recency — each bucket discounted by `decay ** age` (half-life 30 min), so an
aging burst releases its grip smoothly and the ceiling glides rather than snaps;
- robustness — a high percentile (P90) of the weighted counts, not their max, so a
freak-busy bucket clips to full height instead of crushing every other bar;
- floor — never below a small floor, so a stray packet in a lull stays a green nub
on the baseline, not a full column.
The header pulse scales over the monitor's full six-hour history (deeper than the
row draws), and the channel manager pools every visible channel's histogram into
one shared ceiling (memoised per snapshot), so the rows stay comparable. To give
the channel peak history to decay over, widen its query to 6h/72 buckets while the
sparkline still draws only the newest 24 (2h). Split the dashboard's 2h
observation window off into its own OBSERVATION_WINDOW so it keeps its "reception
over 2 h" meaning. The tall dashboard chart is left on its honest max — it quotes
real magnitudes on its axis.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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