Very strange, had already answered this one a couple of days ago, but the answer has disappeared... So once again: You can control this via the JIRA notification scheme (Administration/Issues/Notification schemes). There are a couple of entries referring to creating and editing work logs ("Work Logged On Issue (System)", "Issue Worklog Updated (System)", "Issue Worklog Deleted"). These notifications are enabled by default for reporter, watchers and assignee and you should change/delete them.
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs