Hi David,
In the spirit of being an open company: the message is correct. We are updating our cloud infrastructure and it should make customers experiences even better. From our analytics we can see that this issue only seems to be affecting a very small number of customers for a very small number of add-ons.
Even so, we are treating this issue as a top priority bug and are working hard to get a fix out the door. Even so, because it is of both the nature of the fix and the low number of affected customers, we will be rolling the fix out to production slowly over the coming working days.
Cheers,
Robert
Note: This is only the case for Confluence. JIRA will likely stop showing this message sometime in the next week or two. There is less urgency there because an even smaller number of JIRA customers are affected by this issue.