public Builder protocol(@Nullable Output<String> protocol) {
            $.protocol = protocol;
            return this;
        }
@param protocol Optional.  The protocol (TCP, UDP, or SCTP) which traffic must match. If not specified, this field defaults to TCP.

@return builder
sdk/java/src/main/java/com/pulumi/kubernetes/extensions/v1beta1/inputs/NetworkPolicyPortArgs.java