public Builder setTags(int index, java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      ensureTagsIsMutable();
      tags_.set(index, value);
      bitField0_ |= 0x00010000;
      onChanged();
      return this;
    }
<pre>
Tags to apply to the TPU Node. Tags are used to identify valid sources or
targets for network firewalls.
</pre>

<code>repeated string tags = 40;</code>

@param index The index to set the value at.
@param value The tags to set.
@return This builder for chaining.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java