reboot required by apt
This check indicates that some packages have been installed but cannot be activated without rebooting the machines.
See the rebooting machines for what to do.
If there are a high number of machines requiring a reboot, including ones that are not part of database clusters (such as Mongo and MySQL machines) there may be a problem with the locking mechanism.
Check if this is the case using Fabric:
fab <environment> locksmith.status
If there is a lock in place it will detail which machine holds the lock. You can remove it with:
fab <environment> locksmith.unlock:"<machine-name>"
Machines which are safe to reboot should then do so at the scheduled time.This page is owned by #2ndline and needs to be reviewed