@java.lang.Override
  public boolean hasUpdateMask() {
    return ((bitField0_ & 0x00000001) != 0);
  }
<pre>
Required. Field mask is used to specify the fields to be overwritten in the
ReportConfig resource by the update.
The fields specified in the update_mask are relative to the resource, not
the full request. A field will be overwritten if it is in the mask. If the
user does not provide a mask then all fields will be overwritten.
</pre>

<code>.google.protobuf.FieldMask update_mask = 1 [(.google.api.field_behavior) = REQUIRED];
</code>

@return Whether the updateMask field is set.
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/UpdateReportConfigRequest.java