/// <summary>
 /// Marks the event as being a critical occurrence.
 /// </summary>
 public static ILogBuilder Critical(this ILogBuilder builder, bool isCritical = true)
 {
     return(isCritical ? builder.Tag("Critical") : builder);
 }
 public static ILogBuilder Tag(this ILogBuilder builder, string tag)
 {
     return(builder.Tag(new[] { tag }));
 }