modules/prometheus: move to monitor directory

modules/nixos/monitor/exporters.nix

@@ -0,0 +1,70 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  inherit (lib) mkIf;
+  cfg = config.custom.prometheus.exporters;
+in
+{
+  config = {
+    systemd.services.tailscaled.after =
+      (lib.optional cfg.node.enable "prometheus-node-exporters.service")
+      ++ (lib.optional cfg.blackbox.enable "prometheus-blackbox-exporters.service")
+      ++ (lib.optional config.services.caddy.enable "caddy.service");
+
+    services.prometheus.exporters.node = mkIf cfg.node.enable {
+      enable = true;
+      enabledCollectors = [
+        "loadavg"
+        "time"
+        "systemd"
+      ];
+      listenAddress = cfg.node.listenAddress;
+      port = 9100;
+    };
+
+    services.prometheus.exporters.blackbox = mkIf cfg.blackbox.enable {
+      enable = true;
+      listenAddress = cfg.blackbox.listenAddress;
+      configFile = pkgs.writeText "blackbox.config.yaml" (
+        lib.generators.toYAML { } {
+          modules = {
+            tcp4_connect = {
+              prober = "tcp";
+              tcp = {
+                ip_protocol_fallback = false;
+                preferred_ip_protocol = "ip4";
+                tls = false;
+              };
+              timeout = "15s";
+            };
+          };
+        }
+      );
+    };
+
+    services.gotosocial.settings = {
+      metrics-enabled = true;
+    };
+
+    services.immich.environment = {
+      IMMICH_TELEMETRY_INCLUDE = "all";
+    };
+
+    services.restic.server.prometheus = true;
+    systemd.services.miniflux.environment.METRICS_COLLECTOR = "1";
+    services.ntfy-sh.settings.enable-metrics = true;
+
+    services.caddy.globalConfig = ''
+      servers {
+        metrics
+      }
+
+      admin ${config.networking.hostName}.coho-tet.ts.net:2019 {
+      }
+    '';
+  };
+}