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I want to upgrade jira from 7.1.9 to 8.0, can anyone suggest me if I upgrade the version my existing data will remains there or not? what are the changes will occur in my existing Jira project. Please suggest.
As @Nic Brough _Adaptavist_ said, read the release notes. As for your data question, all of your data will be safe. As with any major upgrade, I would advise confirming you have a full backup available before starting work.
If you made any customizations to Jira you should back them up before upgrading.
Hello Atlassian Community! Feedback from customers like you has helped us shape and improve Jira Software. As Head of Product, Jira Software, I wanted to take this opportunity to share an update on...