modules/monitoring: Extract metrics from nginx logs

hosts/monitoring-3/prometheus.nix

@@ -52,6 +52,12 @@ let
     attrByPath ["clerie" "monitoring" "blackbox"] false host.config)
     monitoringHosts);
 
+  nginxlogMonitoringTargets = mapAttrsToList (name: host:
+    "${host.config.networking.hostName}.mon.clerie.de:9117")
+    (filterAttrs (name: host:
+    attrByPath ["services" "prometheus" "exporters" "nginxlog" "enable"] false host.config)
+    monitoringHosts);
+
   eachWithEachOther = (f: x: y: lib.lists.flatten (lib.lists.forEach x (a: lib.lists.forEach y (b: f a b))));
 
 in {
@@ -536,6 +542,18 @@ in {
           }
         ];
       }
+      {
+        job_name = "nginxlog-exporter";
+        scrape_interval = "20s";
+        static_configs = [
+          {
+            targets = nginxlogMonitoringTargets;
+          }
+        ];
+        relabel_configs = [
+          relabelAddressToInstance
+        ];
+      }
     ];
     alertmanagers = [
       {

hosts/web-2/clerie.nix

@@ -53,9 +53,6 @@
         '';
         return = "200 ''";
       };
-      extraConfig = ''
-        access_log /var/log/nginx/clerie.de.log combined_anon;
-      '';
     };
   };
 }

hosts/web-2/gitea.nix

@@ -83,9 +83,6 @@
           proxyPass = "http://[::1]:3000";
         };
       };
-      extraConfig = ''
-        access_log /var/log/nginx/git.clerie.de.log combined_anon;
-      '';
     };
   };
 }

hosts/web-2/ip.nix

@@ -53,9 +53,6 @@
           types { } default_type "text/html; charset=utf-8";
         '';
       };
-      extraConfig = ''
-        access_log /var/log/nginx/ip.clerie.de.log vcombined_anon;
-      '';
     };
     "ip4.clerie.de" = {
       enableACME = true;
@@ -67,9 +64,6 @@
           add_header Access-Control-Allow-Origin *;
         '';
       };
-      extraConfig = ''
-        access_log /var/log/nginx/ip.clerie.de.log vcombined_anon;
-      '';
     };
     "ip6.clerie.de" = {
       enableACME = true;
@@ -81,9 +75,6 @@
           add_header Access-Control-Allow-Origin *;
         '';
       };
-      extraConfig = ''
-        access_log /var/log/nginx/ip.clerie.de.log vcombined_anon;
-      '';
     };
   };
 }