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Parse Prometheus text format from proxy /metrics endpoints using expfmt, store snapshots in per-instance ring buffers (~1h retention at 10s intervals), compute per-second rates from counter deltas (handling resets), compute p50/p95/p99 from histogram buckets via linear interpolation, and expose results via REST API (GET /api/metrics/{id}, GET /api/metrics/fleet).
New admin/metrics package: parser, ring buffer, rate/percentile math, and Collector orchestrator. Poller extended to scrape /metrics on successful health probes. Fleet endpoint aggregates KPIs across instances with trend indicators vs 1h ago.
…l, and vendor charts - Add ECharts + vue-echarts with tree-shaken imports (line chart, grid, tooltip, legend, data zoom) - Add metrics formatting utilities (formatRps, formatLatency, formatErrorRate, formatCount, trendDirection) with 25 tests - Add metrics Pinia store for fleet and instance metrics with 6 tests - Add FleetKpiPanel with 4 KPI cards (RPS, error rate, connections, panics) and trend indicators - Add instance detail view at /instances/:id with breadcrumb, status header, and Overview/Traffic tabs - Overview tab: 5 KPI cards + P50/P95/P99 latency time-series chart - Traffic tab: interactive vendor table with checkboxes, color dots, totals row; 3 stacked charts (RPS, Latency, Error Rate) per selected vendor - Latency chart shows P50/P95/P99 for single vendor, P99-only for multiple (per design spec) - Auto-select top 3 vendors by RPS, prune stale selections when vendor list changes - Make instance cards and table rows clickable to navigate to detail view - Add P50/P95 fields to SeriesPoint in Go backend for overview latency chart - Escape HTML in ECharts tooltip formatters to prevent XSS via vendor IDs - Add tabpanel ARIA roles for accessibility
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