jclouds-plugin not removing last slave

[David Resnick]

We're using the JClouds plugin with cloudstack and a retention time of 240 minutes.

Slaves are spinning up on demand and are generally brought offline as expected. 

There is a problem with the last slave; even when it is unused for more than 240 minutes, it is never brought offline. It is always the longest living slave that is kept.

Has anyone had the same experience? Any ideas on getting this working correctly?

Jenkins 1.642.1

jclouds-plugin 2.9

Thanks,

David