aurweb: enable goaurrpc metrics

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>

roles/aurweb/templates/goaurrpc.conf.j2

@@ -16,5 +16,6 @@
 	"KeyFile": "",
 	"EnableSearchCache": true,
 	"CacheCleanupInterval": 60,
-	"CacheExpirationTime": 180
+	"CacheExpirationTime": 180,
+	"EnableMetrics": true
 }

roles/aurweb/templates/nginx.d.conf.j2

@@ -118,6 +118,12 @@ server {
         proxy_set_header X-Forwarded-For $remote_addr;
     }
 
+    location /rpc/metrics {
+        rewrite ^/rpc.php /rpc last;
+        proxy_pass http://127.0.0.1:10666/metrics;
+        proxy_set_header X-Forwarded-For $remote_addr;
+    }
+
     location / {
         # Proxy over to aurweb's ASGI application.
         proxy_pass http://{{ aurweb_asgi_bind }};