public Builder removeLabels(java.lang.String key) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      internalGetMutableLabels().getMutableMap().remove(key);
      return this;
    }
<pre>
Optional. Labels as key value pairs. The key and value should contain
characters which are UTF-8 compliant and less than 50 characters.
</pre>

<code>map&lt;string, string&gt; labels = 4 [(.google.api.field_behavior) = OPTIONAL];</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/EdgeSlm.java