After upgrade to 1.22.3 from 1.21.3 no new slave pods were created and following exception was visible in the log:

2020-01-01 09:23:16.158+0000 [id=48] WARNING o.c.j.p.k.KubernetesCloud#provision: Failed to count the # of live instances on Kubernetes
io.fabric8.kubernetes.client.KubernetesClientException: Failure executing: GET at: https://b22.jonqe.lab.eng.bos.redhat.com:8443/api/v1/namespaces/jenkins-slaves/pods?labelSelector=jenkins%3Dslave%2Cjenkins%2Flabel%3Dkiali-build%20golang%20nodejs%20yarn. Message: found 'golang', expected: ',' or 'end of string'. Received status: Status(apiVersion=v1, code=400, details=null, kind=Status, message=found 'golang', expected: ',' or 'end of string', metadata=ListMeta(_continue=null, remainingItemCount=null, resourceVersion=null, selfLink=null, additionalProperties={}), reason=BadRequest, status=Failure, additionalProperties={}).

Looks like the new plugin version is using spaces between labels in the API call but OpenShift API expects commas.

Full exception is attached.