private com.google.protobuf.MapField<java.lang.String, java.lang.String>
        internalGetMutableAnnotations() {
      if (annotations_ == null) {
        annotations_ =
            com.google.protobuf.MapField.newMapField(AnnotationsDefaultEntryHolder.defaultEntry);
      }
      if (!annotations_.isMutable()) {
        annotations_ = annotations_.copy();
      }
      bitField0_ |= 0x00000010;
      onChanged();
      return annotations_;
    }
<pre>
Labels as key value pairs
</pre>

<code>map&lt;string, string&gt; labels = 4;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Cluster.java