Existing email triggering mechanism based on Filter Subscription works only based on scheduled time but not on any delta or change to result set such as increase in count. Is there any means to trigger email for subscribed filter in case the result count increases.
You would need to write some code to achieve this. What exactly is your requirement?
If you want to be informed if an issue has been updated or a status has changed you could use filter like
updated > -15m or Status changed after -15m
and then use a filter subscription which sends out a mail every 15 minutes (use "send no mail if filter result is empty")
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