public Builder addProjectAllowlist(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      ensureProjectAllowlistIsMutable();
      projectAllowlist_.add(value);
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
A list of Projects from which the forwarding rule will target the service
attachment.
</pre>

<code>repeated string project_allowlist = 2;</code>

@param value The projectAllowlist to add.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/PrivateServiceConnectConfig.java