we have a limitation of 40 slaves and very long job queues. if 40 slaves limit is reached (instances created ok), jobs from queue are waiting for existing slaves. it's ok too.

but even with some slaves deleted Openstack plugin do not create new ones. i.e. if there is 1 slave and 10 jobs - all jobs will be waiting for that running slave instead of creation new slaves.

plugin must recheck periodically if there is some free slot to create a new slave, because setup is dynamic, some slaves may be created, some deleted already.

thanks