yoshihiro.matsumoto

The `ForwardedHeadersFilter` class currently defines two Logger instances: one is a static member https://github.com/spring-cloud/spring-cloud-gateway/blob/348ad0cef166a08faa004f023cc7a3b28df5c773/spring-cloud-gateway-server-webflux/src/main/java/org/springframework/cloud/gateway/filter/headers/ForwardedHeadersFilter.java#L49 and the other is an instance member https://github.com/spring-cloud/spring-cloud-gateway/blob/348ad0cef166a08faa004f023cc7a3b28df5c773/spring-cloud-gateway-server-webflux/src/main/java/org/springframework/cloud/gateway/filter/headers/ForwardedHeadersFilter.java#L53 Having both is redundant and can cause confusion....