@Override
    protected String policyName() {
        return "Principal";
    }
Allows all {@code sasl} configurations to be overridden via the connector configs by setting {@code connector.client.config.override.policy} to
{@code Principal}. This allows to set a principal per connector.
connect/runtime/src/main/java/org/apache/kafka/connect/connector/policy/PrincipalConnectorClientConfigOverridePolicy.java