chore: move configs to system directories

configs/monitoring.nix

@@ -0,0 +1,75 @@
+{ config, pkgs, ... }:
+{
+  services.nginx.virtualHosts.default = {
+    locations."= /stub_status".extraConfig = "stub_status;";
+  };
+
+  services.prometheus = {
+    enable = true;
+    port = 9001;
+    exporters = {
+      nginx.enable = false;
+      node = {
+        enable = true;
+        enabledCollectors = [
+          "conntrack"
+          "diskstats"
+          "entropy"
+          "filefd"
+          "filesystem"
+          "loadavg"
+          "mdadm"
+          "meminfo"
+          "netdev"
+          "netstat"
+          "stat"
+          "time"
+          "vmstat"
+          "systemd"
+          "logind"
+          "interrupts"
+          "ksmd"
+        ];
+        port = 9002;
+      };
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ config.services.prometheus.exporters.node.port ];
+
+  systemd.services.promtail = {
+    description = "Promtail service for Loki";
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.grafana-loki}/bin/promtail --config.file ${(pkgs.formats.yaml {}).generate "promtail.yaml" {
+          server = {
+            http_listen_port = 28183;
+            grpc_listen_port = 0;
+          };
+          positions.filename = "/tmp/positions.yaml";
+          clients = [
+            { url = "http://${if config.networking.hostName == "makanek" then "127.0.0.1" else "makanek.r"}:3100/loki/api/v1/push"; }
+          ];
+          scrape_configs = [
+            {
+              job_name = "journal";
+              journal = {
+                max_age = "12h";
+                labels.job = "systemd-journal";
+                labels.host = config.networking.hostName;
+              };
+              relabel_configs = [
+                {
+                  source_labels = [ "__journal__systemd_unit" ];
+                  target_label = "unit";
+                }
+              ];
+            }
+          ];
+        }}
+      '';
+    };
+  };
+}