Fix the pool metrics

guix-data-service/web/server.scm

@@ -101,7 +101,6 @@
   (%guix-data-service-metrics-registry registry)
 
   (let ((finished?         (make-condition))
-        (render-metrics    (make-render-metrics registry))
         (request-scheduler #f))
     (call-with-sigint
      (lambda ()
@@ -218,6 +217,7 @@ port. Also, the port used can be changed by passing the --port option.\n"
                         conn)))
                    request-scheduler)
 
+                  (let ((render-metrics (make-render-metrics registry)))
                     (run-server/patched
                      (lambda (request body)
                        (metric-increment requests-metric)
@@ -238,7 +238,7 @@ port. Also, the port used can be changed by passing the --port option.\n"
 
                          (apply values (get-message reply))))
                      #:host host
-                   #:port port))
+                     #:port port)))
                 #:unwind? #t)))
 
           ;; Guile sometimes just seems to stop listening on the port, so try