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Just restarting a connector (without altering the configuration) has no effect on the recorded set of active topics for that connector.

Reconfiguring a source connector also has no effect for a source connector's on the recorded set of active topics.  Reconfiguring a sink connector, on the other hand, may change the consumed topics, and any topics no longer consumed will be removed from the set of active topics for this sink connector by appending tombstone messages appropriately after the reconfiguration of the connector.For sink connectors, that means that a topic that was included in the previous configuration of the connector but is not included in the current configuration, will still show up in the set of active topics. An explicit reset request will have to be issued (immediately after the connector is reconfigured) in order to remove these old topics from the connectors active set. This requirement is suggested in this KIP to keep the symmetry between source and sink connectors with respect to reset and also keep the new as well as the existing Connect REST API endpoints simple and with a focused mission. 

Deleting a connector will reset this connector's set of active topics even when resetting topic tracking for connectors has been disabled. Successful reset of the history of topics used by connectors does depend on whether the connector was gracefully deleted. Partial reset can be followed by another attempt to reset topic tracking of topics for a connector. 

Extensions to Connect REST API

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