We will have a scheduled maintenance window tonight from 7:00pm to 11:00pm PDT. The following changes will take place:

7:00pm PDT (0200 UTC) labs.mozilla.com migration. We’ll be migrating labs.mozilla.com to mozillalabs.com (bug 489638). Duration 60 minutes.
9:00pm PDT (0400 UTC) addons.mozilla.org backend server maintenance. We’ll be making changes to the backend storage (bug 517015) and [...]

We will have a scheduled maintenance window tonight from 5:00pm to  8:00pm PDT. The following changes will take place:
* 5:00pm PDT (0000 UTC) addons.mozilla.org database hardware upgrade. We’ll be adding additional RAM to the master database server for addons.mozilla.org. (bug 522112). Duration 30 minutes (although the site may stay down pending completion of the file [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

9:00pm PDT (0400 UTC) addons.mozilla.org update. We’ll be updating addons.mozilla.org to pick up code updates (bug 523428). Duration 30 minutes.
9:00pm PDT (0400 UTC) We’ll be rolling changes to push several production websites out of Amsterdam. [...]

Due to a disk drive running out of space, the slave server for our C01 database has gotten corrupted, and needs to be resynchronized with the master database.  This will necessitate taking the master database offline for the duration of the re-sync, which should take approximately 25 minutes.
This will begin at 11am PDT (about 10 [...]

We will have a scheduled maintenance window tonight from 8:00pm to 11:00pm PDT. The following changes will take place:

7:30pm PDT (0230 UTC): Cisco FWSM OS upgrade. We’ll be updating the Cisco firewall module. No downtime is expected.
8:00pm PDT (0300 UTC) support.mozilla.com / SUMO updates. We’ll be updating support.mozilla.com to pick up code updates (bug [...]