[Jenkins-infra] JIRA Maintenance this Sunday at 12PM UTC

[Olblak]

Hello,

I'll upgrade issues.jenkins.io to the latest stable Jira version, this Sunday at noon (UTC).
According my test, the upgrade should be smooth. 

You can follow the migration on IRC '#jenkins-infra' or with the JIRA ticket 'INFRA-1682', once Jira is back.

Feel free to report any weird behaviors once the Jira ticket is marked as 'done'.