There will be an outage starting at 2017-08-04 21:00 UTC, which will last
approximately 15 hours.
To convert UTC to your local time, take a look at
date -d '2017-08-04 21:00 UTC'
Reason for outage: important HyperKitty database schema change
* HyperKitty, the mailing-list archives and reading interface
* Postorius, the mailing-list administration interface
Mailman will not be affected, emails sent to the lists will continue to be
delivered during the outage, but they will not be archived at that time
(the archiver will be offline). The emails delivered during the outage
will be added to the archives when they are back online.
ticket for this outage above.