Enable Prometheus/Grafana/Loki

modules/prometheus/default.nix

@@ -0,0 +1,33 @@
+{config, ...}: let
+  cfg = config.services.prometheus;
+in {
+  services.prometheus = {
+    enable = true;
+    checkConfig = false; # Otherwise it will fail because it cannot access bearer_token_file
+    webExternalUrl = "https://status.aciceri.dev";
+    globalConfig.scrape_interval = "10s";
+    scrapeConfigs = [
+      {
+        job_name = "hass";
+        metrics_path = "/api/prometheus";
+        bearer_token_file = config.age.secrets.home-assistant-token.path;
+        static_configs = [
+          {
+            targets = ["sisko.fleet:${builtins.toString config.services.home-assistant.config.http.server_port}"];
+          }
+        ];
+      }
+      {
+        job_name = "node";
+        static_configs = [
+          {
+            targets = builtins.map (host: "${host}.fleet:9100") ["sisko" "picard"];
+          }
+        ];
+      }
+    ];
+  };
+  environment.persistence."/persist".directories = [
+    "/var/lib/${cfg.stateDir}"
+  ];
+}