The inventory implementation on the Java-side of the Middleware manager has changed. This change needs to be brought forward to ManageIQ/ Cloudforms. This requires bumping the hawkular-ruby-gem to version 3.0.1 See also https://github.com/ManageIQ/manageiq-gems-pending/pull/138#issuecomment-297736552
Upstream PRs: https://github.com/ManageIQ/manageiq-providers-hawkular/pull/10 https://github.com/ManageIQ/manageiq/pull/14543 https://github.com/ManageIQ/manageiq-gems-pending/pull/138
Verified on 5.9.0.2.20171010190026_0413a06 Issues was created for cfme-5.8 version to support Inventory in Metrics. cfme-5.9 also supports Inventory in Metrics.