protected void handleServerHeartbeat(Event event) {
        LOGGER.trace("Server heartbeat: {}", event);
    }
Handle the supplied event that is sent by a primary to a replica to let the replica know that the primary is still alive. Not
written to a binary log.

@param event the server stopped event to be processed; may not be null
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mysql-cdc/src/main/java/io/debezium/connector/mysql/MySqlStreamingChangeEventSource.java