Function ensurePrewarmPool

controller/prewarm.go:46–56

(addr string, desired int)

	wg     sync.WaitGroup

	mu        sync.Mutex
	idle      []idlePrewarmConn
	rules     map[string]*config.Rule
	warming   int
	failures  int
	nextRetry time.Time
	stopped   bool
}

// initPrewarm 会为规则中的每个目标开启后台保温。
func initPrewarm(rule *config.Rule) {
	defaultRoutingRuntime.prewarm.init(rule)
}