HasUnreadCounts
Interface that marks a ChatEvent as having the information about unread counts. There are certain cases when the server omits these fields (e.g. when ReadEvents option is disabled, when the number of watchers is over 100, etc). In that case totalUnreadCount and unreadChannels fields have 0 values.
The list of events which contain unread counts:
message.new
notification.message_new
notification.mark_read
notification.added_to_channel
notification.channel_deleted
notification.channel_truncated