code: @BetaApi
    public final Operation setShieldedInstanceIntegrityPolicyInstance(
        ProjectZoneInstanceName instance,
        ShieldedInstanceIntegrityPolicy shieldedInstanceIntegrityPolicyResource,
        List<String> fieldMask) {
  
      SetShieldedInstanceIntegrityPolicyInstanceHttpRequest request =
          SetShieldedInstanceIntegrityPolicyInstanceHttpRequest.newBuilder()
              .setInstance(instance == null ? null : instance.toString())
              .setShieldedInstanceIntegrityPolicyResource(shieldedInstanceIntegrityPolicyResource)
              .addAllFieldMask(fieldMask)
              .build();
      return setShieldedInstanceIntegrityPolicyInstance(request);
    }
docs: Sets the Shielded Instance integrity policy for an instance. You can only use this method on a
  running instance. This method supports PATCH semantics and uses the JSON merge patch format and
  processing rules.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceClient instanceClient = InstanceClient.create()) {
  ProjectZoneInstanceName instance = ProjectZoneInstanceName.of("[PROJECT]", "[ZONE]", "[INSTANCE]");
  ShieldedInstanceIntegrityPolicy shieldedInstanceIntegrityPolicyResource = ShieldedInstanceIntegrityPolicy.newBuilder().build();
  List&lt;String&gt; fieldMask = new ArrayList&lt;&gt;();
  Operation response = instanceClient.setShieldedInstanceIntegrityPolicyInstance(instance, shieldedInstanceIntegrityPolicyResource, fieldMask);
  }
  </code></pre>
  
  @param instance Name or id of the instance scoping this request.
  @param shieldedInstanceIntegrityPolicyResource The policy describes the baseline against which
  Instance boot integrity is measured.
  @param fieldMask The fields that should be serialized (even if they have empty values). If the
  containing message object has a non-null fieldmask, then all the fields in the field mask
  (and only those fields in the field mask) will be serialized. If the containing object does
  not have a fieldmask, then only non-empty fields will be serialized.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails