MqttTopic             = "topic"
	MqttQoS               = "qos"
	MqttUsername          = "username"
	MqttPassword          = "password"
	MqttReconnectInterval = "reconnect_interval"
	MqttKeepAliveInterval = "keep_alive_interval"
	MqttQueueDir          = "queue_dir"
	MqttQueueLimit        = "queue_limit"

	EnvMQTTEnable            = "MINIO_NOTIFY_MQTT_ENABLE"
	EnvMQTTBroker            = "MINIO_NOTIFY_MQTT_BROKER"

username             (string)    MQTT username
password             (string)    MQTT password
qos                  (number)    set the quality of service priority, defaults to '0'
keep_alive_interval  (duration)  keep-alive interval for MQTT connections in s,m,h,d
reconnect_interval   (duration)  reconnect interval for MQTT connections in s,m,h,d

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		if err != nil {
			return nil, err
		}

		keepAliveIntervalEnv := target.EnvMQTTKeepAliveInterval
		if k != config.Default {
			keepAliveIntervalEnv = keepAliveIntervalEnv + config.Default + k
		}
		keepAliveInterval, err := time.ParseDuration(env.Get(keepAliveIntervalEnv,
			kv.Get(target.MqttKeepAliveInterval)))
		if err != nil {
			return nil, err
		}

		queueLimitEnv := target.EnvMQTTQueueLimit