Notification policies define what notifications to send to Mattermost when issue events occur, such as create issue, edit issue, add comment, etc.
These notification policies are defined at the project level.
To create a policy notification go to 
for your project, then Mattermost Settings.
Click the cog icon 
for a Project Channel . To create a policy click
.
Name your policy. If desired enter a JQL Filter. You can send notifications for the following events in JIRA.
Issue Created, Updated, Deleted, Closed or Resolved.
Comment Created, Edited or Deleted.
Link Created or Deleted.
Choose as many events as you wish for notification sending.
Click Save.
