Hello Atlassian,
Due to the fact that many of our clients and offshore offices are spread out across the world in various timezones, our CTO is interested in performing JIRA upgrades without the need to interrupt the service (however briefly). I have searched your documents but have not found any references to this possibility -- according to the official, supported method the service is shut down for the duration of the upgrade.
Please point me to the right documentation, or let me know if there is a way to do this. Our thinking is that you probably upgrade your own support JIRA instance in some sort of uninterrupted manner.
Thank you,
Saul Perdomo