contrib/internal/httptrace: log error if regex fails

This should be logged as an error to let the user know that their
provided regex was faulty and was not able to be loaded

contrib/internal/httptrace/config.go

@@ -47,7 +47,7 @@ func newConfig() config {
 	} else if r, err := regexp.Compile(s); err == nil {
 		c.queryStringRegexp = r
 	} else {
-		log.Debug("Could not compile regexp from %s. Using default regexp instead.", envQueryStringRegexp)
+		log.Error("Could not compile regexp from %s. Using default regexp instead.", envQueryStringRegexp)
 	}
 	return c
 }