I am prepping for our Jira cloud migration and was wondering if I MUST also migrate our server TESTRAIL instance or if I can keep my server version while Jira is on Cloud
You can connect your Jira cloud instance to an on-prem Testrail instance. I did exactly that when we migrated from Jira Server to Jira Cloud last year. You have to make sure your edge firewall allows the Atlassian IP ranges to connect to your Testrail instance and install the free TestRail for JIRA Test Management app in Jira: https://marketplace.atlassian.com/apps/1213701/testrail-test-management-integration-for-jira?hosting=cloud&tab=overview
You will have to configure the app in Jira Cloud but also make configuration changes to your on-prem Testrail instance. Documentation from Gurock (the vendor for Testrail) is here: https://support.testrail.com/hc/en-us/articles/7665131077268
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