if an issue is open more than 3 hours i should get notification scheme in jira software
HiĀ @jagadish kondeti
Welcome to the community!
To achieve this you need to use the Issue filter subscription in Jira.
Please have a look at the below previous discussions, it is not exactly same what you want but using this you can configure it.
https://community.atlassian.com/t5/Jira-questions/Send-notification-when-issue-is-inactive-for-X-days/qaq-p/398258
https://community.atlassian.com/t5/Jira-questions/Notification-when-a-Due-Date-is-near-or-past/qaq-p/339606
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