The connector is able to modify what is logged using different configuration options.
Informational messages like those below indicate that a client-side session did not properly close connection to the connector using a regular mysql close() call.
WARN [MySQLBridge] - [10.3.1.240:35686] C>S ended. S>C streaming did not finish within bridgeServerToClientForcedCloseTimeout=500 (ms). Will be closed anyway ! INFO [MySQLBridge] - [10.3.1.240:35686] Server>Client thread didn't finish cleanly - return code was: 1
Load balancers (especially physical ones) tend to do this when testing the connector, so these messages are expected when behind a load-balancer. Since the same error could come from buggy application code, the default is to log these circumstances.
./tools/tpm configure alpha --connector-disable-connection-warnings=trueshell>
Updating these values require a connector restart (via tpm update) for the changes to be recognized.