aeron-client/src/main/java/io/aeron/ChannelUri.java
public String channelTag()
    {
        return (null != tags && tags.length > CHANNEL_TAG_INDEX) ? tags[CHANNEL_TAG_INDEX] : null;
    }
public String channelTag()
    {
        return (null != tags && tags.length > CHANNEL_TAG_INDEX) ? tags[CHANNEL_TAG_INDEX] : null;
    }
Get the channel tag, if it exists, that refers to an another channel.

@return channel tag if it exists or null if not in this URI.
@see CommonContext#TAGS_PARAM_NAME
@see CommonContext#TAG_PREFIX