feat(monitoring): general fixup

- added healthcheck for every service
- added nginx second "server" block for monitoring
    all monitoring services are now behind this nginx reverse proxy
- fixed logging driver not present for chat service

nginx/conf/monitoring/locations.conf

@@ -0,0 +1,39 @@
+# This is required to proxy Grafana Live WebSocket connections.
+location /kibana {
+    proxy_set_header Host $host;    
+    set $upstream_kibana kibana:5601;
+    proxy_pass http://$upstream_kibana;
+}
+
+location /cadvisor {
+    proxy_set_header Host $host;    
+    set $upstream_cadvisor cadvisor:8080;
+    proxy_pass http://$upstream_cadvisor;
+}
+
+location /grafana {
+    proxy_set_header Host $host;
+    rewrite       ^/grafana/?(.*) /$1 break;
+    set $upstream_grafana grafana:3000;
+    proxy_pass http://$upstream_grafana;
+}
+# Proxy Grafana Live WebSocket connections.
+location /grafana/api/live/ {
+    proxy_http_version 1.1;
+    proxy_set_header Upgrade $http_upgrade;
+    proxy_set_header Connection $connection_upgrade;
+    proxy_set_header Host $host;
+    rewrite       ^/grafana/?(.*) /$1 break;    
+    set $upstream_grafana grafana:3000;
+    proxy_pass http://$upstream_grafana;
+}
+
+location /ok {
+    add_header Content-Type text/plain;
+    return 200 'healthy';
+}
+
+location / {
+    root /var/share/www/monitoring/;
+    index monitoring.index.html;
+}