Flake parts with x64 and ARM support for devshell on both Linux and Mac

nix/monitoring/prometheus.nix

@@ -0,0 +1,21 @@
+{ config, pkgs, ... }: {
+  services.prometheus = {
+    enable = true;
+    port = 7001;
+    exporters = {
+      node = {
+        enable = true;
+        enabledCollectors = [ "systemd" ];
+        port = 7002;
+      };
+    };
+    scrapeConfigs = [
+      {
+        job_name = "eve-psr-nix0";
+        static_configs = [{
+          targets = [ "127.0.0.1:${toString config.services.prometheus.exporters.node.port}" ];
+        }];
+      }
+    ];
+  };
+}