add postgres monitoring

hosts/geon/gitea.nix

@@ -72,6 +72,13 @@
       }
     ];
   };
+  services.prometheus.exporters.postgres = {
+    enable = true;
+    port = 9101;
+    runAsLocalSuperUser = true;
+    openFirewall = true;
+    firewallFilter = "-i wg-monitoring -p tcp -m tcp --dport 9101";
+  };
 
   networking.firewall.allowedTCPPorts = [ 80 443 ];
   services.nginx = {

hosts/kaon/auxMonHosts.nix

@@ -0,0 +1,14 @@
+{ }:
+
+rec {
+
+  postgresExporter = [
+      "kaon.mon.entr0py.de:9101"
+      "luxon.mon.entr0py.de:9101"
+      "geon.mon.entr0py.de:9101"
+  ];
+
+  synapseExporter = [
+      "luxon.mon.entr0py.de:9123"
+  ];
+}

hosts/kaon/monitoring.nix

@@ -23,10 +23,12 @@ let
     "${host.config.networking.hostName}.mon.entr0py.de:9100")
     monitoringHosts;
 
+  auxHosts = (import ./auxMonHosts.nix {});
+
 in {
 
   networking.hosts = {
-    "fd00:23:23:23::1" = [ "monitoring-1.mon.entr0py.de" ];
+    "fd00:23:23:23::1" = [ "kaon.mon.entr0py.de" ];
   }
   // monitoringHostsNames;
 
@@ -62,16 +64,33 @@ in {
       }
       {
         job_name = "node-exporter";
-        scrape_interval = "60s";
+        scrape_interval = "20s";
         static_configs = [
           {
             targets = [
-              "monitoring-1.mon.entr0py.de:9100"
+              "kaon.mon.entr0py.de:9100"
             ]
             ++ monitoringTargets;
           }
         ];
       }
+      {
+        job_name = "postgres";
+        scrape_interval = "5s";
+        static_configs = [
+          {
+            targets = auxHosts.postgresExporter;
+          }
+        ];
+      }
+      {
+        job_name = "synapse";
+        scrape_interval = "5s";
+        metrics_path = "/_synapse/metrics";
+        static_configs = [{
+            targets = auxHosts.synapseExporter;
+        }];
+      }
     ];
   };
 
@@ -86,6 +105,12 @@ in {
       }
     ];
   };
+  services.prometheus.exporters.postgres = {
+    enable = true;
+    runAsLocalSuperUser = true;
+    port = 9101;
+  };
+
   services.grafana = {
     enable  = true;
     domain  = "grafana.monitoring.entr0py.de";