Bulk updates were made to a DM's history
{
"type": "im_history_changed",
"latest": "1358877455.000010",
"ts": "1361482916.000003",
"event_ts": "1361482916.000004"
}
A im_history_changed event is sent to all clients in a DM channel When
bulk changes have occurred to that DM channel's history. When clients receive
this message they should reload chat history for the channel if they have any
cached messages before latest.
These bulk changes may be the result of data importation or bulk action taken by an administrator.
When an event occurs, we will send an HTTP POST request to your Request URL. The outer payload is uniform across all Events API methods, and contains fields like team_id and event. Learn more