d0cf6b534b
When Spring Security sends 302 responses to a login page we don't get any information about the request matching in Spring MVC. Consequently apps can end up with a lot of counter.status.302.* metrics (where "*" can be whatever the user sent). This change treats 3xx the same as 4xx (if it is unmapped it just gets added to a metric called "unmapped" instead of using the actual request path). Fixes gh-2563