This feature is not available yet. As you can see in this [feature request |https://jira.atlassian.com/browse/CONF-20118] there's a lot of comments and votes to submit it.
There's a lot of discussion also in the Manage Watchers [page | https://confluence.atlassian.com/pages/viewpage.action?pageId=218271870]
So feel free to vote and comment, and please if this solved your question vote for it.
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