即時 Dashboard

概觀

stdlib-only HTTP server,搭配 Server-Sent Events 串流即時把 test_record_instance 的統計推送到瀏覽器。適合 demo、戰情室、on-call。

Endpoints

Endpoint	回傳
`GET /`	單頁 HTML(即時 tile + per-name 表格)
`GET /events`	`text/event-stream`,每個 refresh 間隔一筆 JSON snapshot
`GET /snapshot`	一次性 JSON,給 polling client 使用

啟動 / 停止

from je_load_density import start_dashboard, stop_dashboard

start_dashboard(
    host="127.0.0.1", port=8765,
    refresh_seconds=1.0, window_seconds=10.0,
)
# ... 跑 action ...
stop_dashboard()

Snapshot payload 範例:

{
  "totals": {"requests": 1234, "failures": 7, "failure_rate": 0.0057},
  "latency_overall": {"p50_ms": 42, "p95_ms": 180},
  "per_name": {"/checkout": {"count": 200, "p95_ms": 220}},
  "rps": 41.3,
  "avg_ms": 51.2,
  "ts": 1748256000.0
}

Action JSON

[["LD_start_dashboard", {"host": "127.0.0.1", "port": 8765}],
 ["LD_start_test", {...}],
 ["LD_stop_dashboard"]]