Add various XML extensions to the default PHP install.
Add safeguard against rare KVM host crashes due to failed processor MSR read/writes (#12195).
Improve internal NTP server hierarchy to provide more stable system clocks on VMs (#10580, #11540).
Disallow memory overcommit for increased safety. This may affect Redis instances with very large allocations.
Fix bug where Apache’s PHP configuration tends to disappear spontaneously after package upgrades.
Drop discontinued NJABL blacklist for spam filtering.
Adjust RAID controller settings to reduce the chance of data losses after machine crashes.
Improve alerting error handling so that failures in sending out critical alerts are escalated right away (#12190).
Add some flexibility for disk checks so that the 15% limit does not apply blindly on very large volumes (#12036).