Channels
A Channel is a named grouping of subscriptions within Event Channels. Channels let you organize related subscriptions under a single label, for example, one channel for operations alerts and another for security events.
Channels are site-level. All subscriptions on your site, regardless of context, can be organized under channels.
Default Channel
One channel per site can be marked as the default. Subscriptions created without specifying a channel are automatically attached to the default channel. Marking a channel as the default replaces whichever channel was previously the default.
Enabling and Disabling Channels
A disabled channel does not route events. Subscriptions attached to a disabled channel will not deliver events to their targets until the channel is re-enabled.