Custom Attributes.
The modified group info.
The extension fields.
Message sender.
The ID of a group or chatroom.
The member count. For a chat room with more than 2000 members, memberCount will not be returned.
User IDs of group members.
Expiration time for user mute.
The name of a group or chatroom.
The type of operation.
The reason for the event.
The userId of a group event.
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The updated announcement.