Given that the sharing is required to let the events emitted by the SMT have the same run id, the current implementation uses a static field approach. 

This design is based on a strong assumption that the connector and the SMT are loaded by the same class loader. In KC 4.1 this could be not always true given the recent introduction of KIP-891: Running multiple versions of Connector plugins.

The idea is to pass the runId in records header has did for `taskId`, `connectorLogicalName` and `connectorName`.