Real-user metrics · session telemetry · honest calibrating state when data is sparse
window.performance (Navigation Timing L1/L2 + LCP observer).
Cold-start detection is a heuristic proxy via /api/health uptimeSec.
Cron latency reads from serverless logs — no data until cron runs are observed.
All charts are "calibrating" until enough samples accumulate.
Methodology: perf-collector-2026-05-04-v1 [ARCHITECTURAL].
Live readout of window.THV2PaperDriver.stats() — auto-activation kicks in 8s after cockpit page-load. Personal-Data Segregation T0: this surface reads from browser localStorage ONLY; nothing leaves the device.