Translations:ReleaseNotes/Juno/21/en

• Extensible Resource Tracking. The set of resources tracked by nova is hard coded, this change makes that extensible, which will allow plug-ins to track new types of resources for scheduling. launchpad specification
• Allow a host to be evacuated, but with the scheduler selecting destination hosts for the instances moved. launchpad specification
• Add support for host aggregates to scheduler filters. launchpad: disk; instances; and IO ops specification