public Builder mergeFrom(
          com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule other) {
        if (other
            == com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule.getDefaultInstance())
          return this;
        if (!other.getDomain().isEmpty()) {
          domain_ = other.domain_;
          bitField0_ |= 0x00000001;
          onChanged();
        }
        if (!other.nameServers_.isEmpty()) {
          if (nameServers_.isEmpty()) {
            nameServers_ = other.nameServers_;
            bitField0_ |= 0x00000002;
          } else {
            ensureNameServersIsMutable();
            nameServers_.addAll(other.nameServers_);
          }
          onChanged();
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<pre>
A forwarding rule is a mapping of a `domain` to `name_servers`.
This mapping allows VMware Engine to resolve domains for attached private
clouds by forwarding DNS requests for a given domain to the specified
nameservers.
</pre>

Protobuf type {@code google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule}
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/DnsForwarding.java