[Labs-announce] Horizon upgrade tomorrow (Tuesday), 16:00 UTC

[Andrew Bogott]

     Tomorrow I'm going to upgrade https://horizon.wikimedia.org/ from 
version 'Liberty' to version 'Mitaka'.  I've scheduled an hour-long 
window for the upgrade, although the actual switch-over should be much 
shorter.  Downtime should be minimal; I'll be clearing caches as part of 
the upgrade, so login sessions will be interrupted, and performance may 
suffer a bit while the cache is cold.

     The Mitaka version contains a lot of new Javascript front-end 
code.  Some of the new interfaces (in particular the one for creating 
new VMs) are a bit strange and will take some getting used to.  Overall, 
though, the Mitaka upgrade is an improvement, and I have high hopes that 
it will considerably improve performance.

     I've tested the new version extensively, but there may well be 
breakages around the corners of some of our custom features, so don't 
hesitate to notify me if you see new, bad behavior.

-Andrew