// same value `X`.  If the QueuingConfig's DesiredNumQueues field
	// is zero then the other queuing-specific config parameters are
	// not changed, so that the queues continue draining as before.
	// In any case, reconfiguration does not discard any queue unless
	// and until it is undesired and empty.
	BeginConfigChange(QueuingConfig) (QueueSetCompleter, error)

	exitOnZeroActiveConnectionsEnv = env.Register("EXIT_ON_ZERO_ACTIVE_CONNECTIONS",
		false,
		"When set to true, terminates proxy when number of active connections become zero during draining").Get()

	useExternalWorkloadSDSEnv = env.Register("USE_EXTERNAL_WORKLOAD_SDS", false,
		"When set to true, the istio-agent will require an external SDS and will throw an error if the workload SDS socket is not found").Get()