public static boolean useLegacyRouteDecoratorOrdering() {
        return USE_LEGACY_ROUTE_DECORATOR_ORDERING;
    }
Returns whether to order route decorators with legacy order that the first decorator is first applied to.
For example, if a service and decorators are defined like the followings:
<pre>{@code
Server server =
    Server.builder()
          .service("/users", userService)
          .decoratorUnder("/", loggingDecorator)
          .decoratorUnder("/", authDecorator)
          .decoratorUnder("/", traceDecorator)
          .build();
}</pre>
A request will go through the below decorators' order to reach the {@code userService}.
{@code request -> loggingDecorator -> authDecorator -> traceDecorator -> userService}
core/src/main/java/com/linecorp/armeria/common/Flags.java