Struct prewarmPool

controller/prewarm.go:26–33

映射地址到对应的预热池 prewarmPool 维护目标地址对应的一小撮预热 TCP 连接。

	prewarmMaintenancePeriod = 250 * time.Millisecond
)

type idlePrewarmConn struct {
	conn      net.Conn
	idleSince time.Time
}

// prewarmPool maintains a bounded number of short-lived idle connections for
// one target. A single reconciler owns replenishment decisions, while warming
// tracks the small, bounded number of concurrent dials.
type prewarmPool struct {
	manager *prewarmManager