Hi there!
You'll have to do that outside Jira using a proxy to redirect the requests from the Jira Server to a maintenance/crash page. Though in this case, you'll need to know when Jira is down and then manually activate the proxy redirect.
If you want to automatically detect when Jira is down, you could check if the proxy server has some way to create an IF statement to when the Jira Server returns a "400", the proxy redirects the user to the maintenance/crash page.
Doing some searching, I was able to find some ways of doing that with Nginx, which enables you to use Lua capabilities to create an IF logic.
Kind regards,
Maurício Karas
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