We currently support 2 types of activities in Slack: joining a channel and sending messages.

Join a channel

AttributeSub-attributeValue
typechannel_joined
score2
sourceId{Slack ID of the user joining the channel}-{channelId}
crowdInfochannelname of the channel

Send a message

AttributeSub-attributeValue
typemessage
score1
sourceIdSlack ID of the message activity
crowdInfourlURL of the message
crowdInfobodyBody of the message
crowdInfochannelChannel where the message was sent
crowdInforeactionsList of reactions
crowdInfoattachmentsList of attachments
crowdInfothread.idIf the message is part of a thread, the thread ID
crowdInfothread.bodyIf the message is part of a thread, the body of the thread starter