public Builder putLabels(java.lang.String key, java.lang.String value) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      if (value == null) {
        throw new NullPointerException("map value");
      }
      internalGetMutableLabels().getMutableMap().put(key, value);
      bitField0_ |= 0x00000100;
      return this;
    }
<pre>
Optional. Labels are key-value attributes that can be set on a deployment
resource by the user.
</pre>

<code>map&lt;string, string&gt; labels = 9 [(.google.api.field_behavior) = OPTIONAL];</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/Deployment.java