MINIO_NOTIFY_MQTT_TOPIC*               (string)    name of the MQTT topic to publish
MINIO_NOTIFY_MQTT_USERNAME             (string)    MQTT username
MINIO_NOTIFY_MQTT_PASSWORD             (string)    MQTT password
MINIO_NOTIFY_MQTT_QOS                  (number)    set the quality of service priority, defaults to '0'
MINIO_NOTIFY_MQTT_KEEP_ALIVE_INTERVAL  (duration)  keep-alive interval for MQTT connections in s,m,h,d