Module metrics 

Structs

GatewayMetrics

网关运行时监控指标

HourBreakdown

v1.4.84 §14: per-cmd_id per-UTC-hour breakdown for monitoring.

LatencyStats

延迟统计摘要 (微秒)

Functions

install_prometheus_extension

v1.4.90 P1-B: 把 GatewayMetrics 注册为 [futu_auth::metrics::Registry] 的 extension renderer, 让 /metrics HTTP 端点自动包含 per-cmd / per-hour counter.