[Questions] Why heartbeats topic is replicated when using MirrorMaker2?

[alita1991]

I have two Kafka clusters with MirrorMaker2 configured in an active/passive setup. During the switchover operation, I scale down MirrorMaker2 on the active cluster, while on the other cluster, I remove any internal topics and scale up MirrorMaker2.

What I don't understand is why heartbeats topic is created under a different name, such as "source.heartbeats", when the "heartbeats" topic exists on the active cluster. Additionally, after I perform another switchover, I end up with another topic called "source.source.heartbeats".

Is there a way to solve this problem in an easy way, like configuration? For the other topics, I do not see such behaviour.