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MM2 emits a heartbeat topic in each source cluster, which is replicated to demonstrate connectivity through the connectors. Downstream consumers can use this topic to verify that a) the connector is running and b) the corresponding source cluster is available. Heartbeats will get propagated by source and sink connectors s.t. chains like backup.us-west.us-east.heartbeat are possible. Cycle detection prevents infinite recursion.

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heartbeats are replicated between clusters

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