/// <summary>
 /// Sets the user's identity (ie. email address, username, user id) that the event happened to.
 /// </summary>
 /// <param name="builder">The log builder object.</param>
 /// <param name="identity">The user's identity that the event happened to.</param>
 public static ILogBuilder Identity(this ILogBuilder builder, string identity)
 {
     return(builder.Identity(identity, null));
 }