public Builder removeMetadata(java.lang.String key) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      internalGetMutableMetadata().getMutableMap().remove(key);
      return this;
    }
<pre>
Custom metadata to apply to the TPU Node.
Can set startup-script and shutdown-script
</pre>

<code>map&lt;string, string&gt; metadata = 34;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java