Slack Notification > Alerting on mentions
By default, Slack does not alert on @mentions ( @username, @channel, @here, @group ). You have to pass "link_names = 1" in the message payload that you send to Slack. So, a message with @channel would just parse out as plain text @channel and not the trigger form of it. This is helpful for alerting to a channel that you might not visit all the time. A triggered word would send a push notification to alert you to activity in that channel.
I think this would be a great feature to add by default.