The upgrade was performed successfully - we are now, however, often/usually running version 0.9.1.0-dev, with which it is compatible. All systems are working as normal, including the groups, profiles and offline IMs (except offline IMs by email to external recipients). The grid is accessible via the Hypergrid once again and listed on OpenSimWorld. Some minor maintenance was required to restore the PHP world map on the web site.
The code for offline IM by e-mail has largely been restored (due to the upgrade to PHP7 causing some functions to be deprecated) but the SMTP server needs some further work checking so that emails are actually sent delivered. Some SSL certificates for web sites need some brief attention. The Wifi interface needs to be restored, although this is not critical because few people register: most traffic to the grid is via Hypergrid. FreeSwitch voice is not currently available, nor is IRC but neither of these see much use either and are non-priority. For back-end purposes, the settings for Monit need to be migrated to the new server to mitigate any downtime.
Ed.: (1) The Wifi interface is working again.
Ed.: (2) The new mute list module works, including the PHP back end: avatars are greyed-out and IM is blocked but they are not blocked on public chat as of OpenSim 0.9.1.0-dev, which we are using for testing now.
Ed.: (3) Monit is working.
Ed.: (4) Resolved: there was a problem with mixed content on https://wifi.oceangrid.net that blocked the reset password button from working.