After setting up minimum spare instances - instances are not deprovisioned if demand is lower than requested about ec2-fleet-plugin HOT 1 CLOSED

Why this is happening?
Ec2FleetCloud.java:844 - getCurrentSpareInstanceCount
uses
enkins.get().getComputers()
and checks:
if (computer instanceof EC2FleetNodeComputer && !computer.isIdle())
to check how many workers are busy.

Just as a recap method should return a number of currently available spare instances for given fleet. This method is used to determine whether there should be a descaling action performed.

Instead this function calculates the number of available instances via following equation:

countOfInstances - currentBusyInstances
where:

• countOfInstances is a number of instances in a fleet (from FleetStateStats) - this is correct
• currentBusyInstances - number of busy instances on a whole jenkins instances, not only within one given fleet

This is okay if we have one fleet only, and no local workers
This would not work if we have either:

• local slaves that can be busy as well,
• another cloud fleets

from ec2-fleet-plugin.