We have been having issues with the EC2 plugin versions above 1.39 where jenkins wont connect to nodes once stopped.
Our nodes are all set at instance caps of 1 however, when jenkins tries to bring back up a node it successfully launches it but fails to provision as it thinks we have an instance cap of 0 Cannot provision - no capacity for instances: 0
Changing our instance cap to 2 instances allows jenkins to connect to one of the nodes but when it tries to re-startup a second node we then see `Cannot provision - no capacity for instances: 0` It seems like the instance cap is off by one.

SlaveTemplate{ami='ami-0095fb81fe067be99', labels='devops'}. Attempting to provision slave needed by excess workload of 1 units
 Oct 04, 2019 3:17:02 PM INFO hudson.plugins.ec2.EC2Cloud getNewOrExistingAvailableSlave
 SlaveTemplate{ami='ami-0095fb81fe067be99', labels='devops'}. Cannot provision - no capacity for instances: 0

We are running jenkins 2.190.1 with Amazon EC2 plugin version 1.46.1 on an EC2 instance running ubuntu 18.04