Currently we're in a very odd situation wrt to dedicated MessageHub. Basically, a customer pays for 100 partitions and then can see how many have been consumed overall. However, they cannot see which spaces have used partitions without laboriously visiting them one by one. So, if you create a new service instance, you might see "Partitions: 99 used / 100 maximum" in the UI but this instance actually has 0 partitions and could only use 1 more before hitting the limit. We need help from the team to provide an API that gives some kind of usage information break down.
NOTICE TO EU RESIDENTS: per EU Data Protection Policy, if you wish to remove your personal information from the IBM ideas portal, please login to the ideas portal using your previously registered information then change your email to "firstname.lastname@example.org" and first name to "anonymous" and last name to "anonymous". This will ensure that IBM will not send any emails to you about all idea submissions