The Apache Pulsar service type in Pulsar's own terms: tenants, namespaces, topics and subscriptions, decided at every level of a topic's name as Pulsar's own namespace and topic grants are, and the clusters' administration, with Pulsar's produce, consume, functions, sources, sinks and packages actions and its administration. Lookups go through Pulsar's own admin client against one broker or several, signing in with a token, a user name and password, OAuth 2.0 ...