There was indeed something very obvious that I was missing. When I installed scalarizr, I followed the instructions from the git repo, which suggests the following:
What the INSTALL fails to mention is that there are several other packages for the various cloud options:
============================================== N/S Matched: scalarizr ===============================================
scalarizr-base.noarch : Scalarizr converts any server to Scalr-manageable node
scalarizr-cloudstack.noarch : Scalarizr CloudStack (cloud.com) edition scalarizr-devtools.noarch : A scalarizr devtools manager
scalarizr-ec2.noarch : Scalarizr EC2 edition
scalarizr-eucalyptus.noarch : Scalarizr Eucalyptus edition
scalarizr-gce.noarch : Scalarizr Google Compute Engine edition
scalarizr-idcf.noarch : Scalarizr IDCF edition
scalarizr-nimbula.noarch : Scalarizr Nimbula edition
scalarizr-openstack.noarch : Scalarizr OpenStack edition
scalarizr-rackspace.noarch : Scalarizr Rackspace edition
scalarizr-ucloud.noarch : Scalarizr uCloud (Korea Telecom) edition