Scrape prometheus exporters over tailscale

hosts/cube/nextcloud/default.nix

@@ -5,8 +5,6 @@ let
 
   fqdn = "cloud.${domain}";
 
-  prometheusPort = 9060;
-
   nextcloudPackage = pkgs.nextcloud28;
 in systemConfiguration {
   secrets.nextcloudPassword = {
@@ -18,26 +16,12 @@ in systemConfiguration {
     owner = "nextcloud-exporter";
   };
 
-  services.prometheus = {
-    exporters.nextcloud = enabled {
-      listenAddress = "[::1]";
-      port          = prometheusPort;
+  services.prometheus.exporters.nextcloud = enabled {
+    listenAddress = "[::]";
 
-      username     = "admin";
-      url          = "https://${fqdn}";
-      passwordFile = config.secrets.nextcloudExporterPassword.path;
-    };
-
-    scrapeConfigs = [{
-      job_name = "nextcloud";
-
-      static_configs = [{
-        labels.job = "nextcloud";
-        targets    = [
-          "[::1]:${toString prometheusPort}"
-        ];
-      }];
-    }];
+    username     = "admin";
+    url          = "https://${fqdn}";
+    passwordFile = config.secrets.nextcloudExporterPassword.path;
   };
 
   services.postgresql = {

hosts/cube/nginx.nix

@@ -1,27 +1,13 @@
 { lib, pkgs, ... }: with lib;
 
-let
-  prometheusPort = 9030;
-in systemConfiguration {
+systemConfiguration {
   networking.firewall = {
     allowedTCPPorts = [ 443 80 ];
     allowedUDPPorts = [ 443 ];
   };
 
-  services.prometheus = {
-    exporters.nginx = enabled {
-      listenAddress = "[::1]";
-      port          = prometheusPort;
-    };
-
-    scrapeConfigs = [{
-      job_name = "nginx";
-
-      static_configs = [{
-        labels.job = "nginx";
-        targets    = [ "[::1]:${toString prometheusPort}" ];
-      }];
-    }];
+  services.prometheus.exporters.nginx = enabled {
+    listenAddress = "[::]";
   };
 
   services.nginx = enabled {

hosts/cube/postgresql.nix

@@ -1,23 +1,9 @@
 { lib, pkgs, ... }: with lib; merge
 
-(let
-  prometheusPort = 9020;
-in systemConfiguration {
-  services.prometheus = {
-    exporters.postgres = enabled {
-      listenAddress       = "[::1]";
-      port                = prometheusPort;
-      runAsLocalSuperUser = true;
-    };
-
-    scrapeConfigs = [{
-      job_name = "postgres";
-
-      static_configs = [{
-        labels.job = "postgres";
-        targets    = [ "[::1]:${toString prometheusPort}" ];
-      }];
-    }];
+(systemConfiguration {
+  services.prometheus.exporters.postgres = enabled {
+    listenAddress       = "[::]";
+    runAsLocalSuperUser = true;
   };
 
   services.postgresql = enabled {

hosts/cube/prometheus.nix

@@ -1,15 +1,11 @@
-{ lib, ... }: with lib;
+{ self, config, lib, ... }: with lib;
 
-let
-  port = 9000;
-
-  nodeExporterPort = 9010;
-in systemConfiguration {
+systemConfiguration {
   services.grafana.provision.datasources.settings = {
     datasources = [{
       name = "Prometheus";
       type = "prometheus";
-      url  = "http://[::1]:${toString port}";
+      url  = "http://[::1]:${toString config.services.prometheus.port}";
 
       orgId = 1;
     }];
@@ -21,23 +17,20 @@ in systemConfiguration {
   };
 
   services.prometheus = enabled {
-    inherit port;
-
+    listenAddress = "[::]";
     retentionTime = "1w";
 
-    exporters.node = enabled {
-      enabledCollectors = [ "processes" "systemd" ];
-      listenAddress     = "[::1]";
-      port              = nodeExporterPort;
-    };
+    scrapeConfigs = with lib; let
+      configToScrapeConfig = name: { config, ... }: pipe config.services.prometheus.exporters [
+        (filterAttrs (_: value: value.enable or false))
+        (mapAttrsToList (expName: expConfig: {
+          job_name = "${expName}-${name}";
 
-    scrapeConfigs = [{
-      job_name = "node";
-
-      static_configs = [{
-        labels.job = "node";
-        targets    = [ "[::1]:${toString nodeExporterPort}" ];
-      }];
-    }];
+          static_configs = [{
+            targets = [ "${name}:${toString expConfig.port}" ];
+          }];
+        }))
+      ];
+    in flatten (mapAttrsToList configToScrapeConfig self.nixosConfigurations);
   };
 }

hosts/disk/mail/default.nix

@@ -4,27 +4,11 @@ let
   inherit (config.networking) domain;
 
   fqdn = "mail.${domain}";
-
-  prometheusPort = 9040;
 in systemConfiguration {
   secrets.mailPassword.file = ./password.hash.age;
 
-  services.prometheus = {
-    exporters.postfix = enabled {
-      listenAddress = "[::1]";
-      port          = prometheusPort;
-    };
-
-    scrapeConfigs = [{
-      job_name = "postfix";
-
-      static_configs = [{
-        labels.job = "postfix";
-        targets    = [
-          "[::1]:${toString prometheusPort}"
-        ];
-      }];
-    }];
+  services.prometheus.exporters.postfix = enabled {
+    listenAddress = "[::]";
   };
 
   mailserver = enabled {

modules/endlessh-go.nix

@@ -2,24 +2,9 @@
 
 let
   fakeSSHPort    = 22;
-  prometheusPort = 9050;
 in serverSystemConfiguration {
-  services.prometheus = {
-    exporters.endlessh-go = enabled {
-      listenAddress = "[::1]";
-      port          = prometheusPort;
-    };
-
-    scrapeConfigs = [{
-      job_name = "endlessh-go";
-
-      static_configs = [{
-        labels.job = "endlessh-go";
-        targets    = [
-          "[::1]:${toString prometheusPort}"
-        ];
-      }];
-    }];
+  services.prometheus.exporters.endlessh-go = enabled {
+    listenAddress = "[::]";
   };
 
   # `services.endlessh-go.openFirewall` exposes both the Prometheus

modules/node-exporter.nix

@@ -0,0 +1,8 @@
+{ lib, ... }: with lib;
+
+serverSystemConfiguration {
+  services.prometheus.exporters.node = enabled {
+    enabledCollectors = [ "processes" "systemd" ];
+    listenAddress     = "[::]";
+  };
+}

options/endlessh-go-exporter-alias.nix

@@ -5,8 +5,18 @@
 # This works, however.
 
 { config, lib, ... }: {
-  options.services.prometheus.exporters.endlessh-go = lib.mkOption {
-    default = {};
+  options.services.prometheus.exporters.endlessh-go = {
+    enable = lib.mkEnableOption (lib.mdDoc "Prometheus integration");
+
+    listenAddress = lib.mkOption {
+      type = lib.types.str;
+      default = "0.0.0.0";
+    };
+
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 2112;
+    };
   };
 
   config.services.endlessh-go.prometheus = config.services.prometheus.exporters.endlessh-go;