I looked at Project Automation but did not find a rule. There are rules around SLAs however there`s nothing around triggering emails when an issue is not updated in the last 24 hours.
Do you want to send a mail with all those issues to a specific person or group, or to the assignees of said tickets?
For the former, filter by a JQL like this "statusCategory != Done AND updated <=-24h" and then just create an automation which will run every 24h, sending a list of those issues to the specified person/group.
If you want to send a mail to every single assigne with issues not updated in 24h, use this slightly modified JQL ""statusCategory != Done AND updated <=-24h AND assigne = currentUser()" and save it as public. Then create a subscription for it, selecting the wanted group as recepients and configure it to run daily.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.