@Dominik Ludwig
This HCC thread looks duplicate of the following thread:
https://community.hortonworks.com/questions/129949/communication-between-ambari-instances.html?child...
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Yes Once we can access the rest API of the remote cluster then we can extract the information that the ambari server itself is able to extract from it's Database including the information's about the configurations/hosts/metrics (metrics Data is fetched from the AMS data store).
Although ambari server fetches some informations from the JMX URLs of the individual components like NameNode/DataNode .. those informations are not accessible via ambari APIs as they are directly received from the Components.