Current url statistics implementation for spring web can't properly collect failures

[ga-ram]

Current url statistics implementation for spring web uses request attribute org.springframework.web.servlet.HandlerMapping.bestMatchingPattern when collecting urls.

When a request fails, this value changes to /error or any other url values set in spring property server.error.path.
This may lead to an illusion that there is no failed requests in each url.

e.g.) when a request with initial bestMatchingPattern /randomResponseTime/** fails, /top50 response will be:

{"uri":"/randomResponseTime/**","totalCount":2502.0,"failureCount":0.0,"maxTimeMs":13404.0,"avgTimeMs":5060.744204636291,"version":0}
{"uri":"/error","totalCount":608.0,"failureCount":9.0,"maxTimeMs":10012.0,"avgTimeMs":5039.962171052632,"version":0}

Internally spring redirects failed requests to /error, so it may be correct but still misleading.

I will add another interceptor to preserve initial bestMatchingPattern to another request attribute for Pinpoint to use when collecting url statistics for spring web.