Support DefaultWebFilterChain allowing the current filter to provide it's name explicitly

[joebyneil]

Hey 👋

I'm currently working with a spring based project that wraps certain WebFilters in an instrumentation decorator. Because of this, the checkpoint in DefaultWebFilterChain outputs the class name of the wrapper rather than the underlying filter.

spring-framework/spring-web/src/main/java/org/springframework/web/server/handler/DefaultWebFilterChain.java

Lines 112 to 115 in c4e25a1

	private Mono<Void> invokeFilter(WebFilter current, DefaultWebFilterChain chain, ServerWebExchange exchange) {
	String currentName = current.getClass().getName();
	return current.filter(exchange, chain).checkpoint(currentName + " [DefaultWebFilterChain]");
	}

eg. DefaultWebFilterChain -> InstrumentationDecorator -> ConcreteWebFilter will checkpoint the name as "InstrumentationDecorator [DefaultWebFilterChain]". Our ideal is "ConcreteWebFilter [DefaultWebFilterChain]", or even just "ConcreteWebFilter".

I'm hoping that we could either:

• Disable the checkpoint in DefaultWebFilterChain
  OR
• Provide the name of each WebFilter explicitly

Thanks for your help!