docs: function ErrorMessage() {
  
    this.eventTime = (new Date()).toISOString();
    this.serviceContext = {service : 'node', version : undefined};
    this.message = '';
    this.context = {
      httpRequest : {
        method : '',
        url : '',
        userAgent : '',
        referrer : '',
        responseStatusCode : 0,
        remoteIp : ''
      },
      user : '',
      reportLocation : {filePath : '', lineNumber : 0, functionName : ''}
    };
  }