Add dummy /metrics endpoint (#327)

internal/utils/validator.go

@@ -57,7 +57,7 @@ func validateReservedKeywords(fl validator.FieldLevel) bool {
 	name := fl.Field().String()
 
 	restrictedNames := map[string]struct{}{}
-	for _, restrictedName := range []string{"assets", "register", "login", "logout", "settings", "admin-panel", "all", "search", "init", "healthcheck", "preview"} {
+	for _, restrictedName := range []string{"assets", "register", "login", "logout", "settings", "admin-panel", "all", "search", "init", "healthcheck", "preview", "metrics"} {
 		restrictedNames[restrictedName] = struct{}{}
 	}