Adds Prometheus/Grafana monitoring infrastructure

docker/gunicorn_config.py

@@ -6,3 +6,4 @@ errorlog = '-'
 accesslog = '-'
 capture_output = False
 loglevel = 'info'
+raw_env = 'prometheus_multiproc_dir=/tmp/metrics'

docker/nginx.conf

@@ -32,4 +32,13 @@ http {
             add_header P3P 'CP="ALL DSP COR PSAa PSDa OUR NOR ONL UNI COM NAV"';
         }
     }
+
+    server {
+        listen      8081;
+        access_log  off;
+
+        location = /stub_status {
+            stub_status;
+        }
+    }
 }