Replace telegraf with node exporter

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/impermanence/default.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
-}:
+{ config, pkgs, ... }:
 {
   imports = [ ./options.nix ];
 
@@ -11,15 +6,15 @@
   # https://github.com/NixOS/nixpkgs/blob/master/nixos/doc/manual/administration/systemd-state.section.md
   # https://github.com/NixOS/nixpkgs/pull/286140/files
   # https://git.eisfunke.com/config/nixos/-/blob/e65e1dc21d06d07b454005762b177ef151f8bfb6/nixos/machine-id.nix
-  sops.secrets."machineId".mode = "0444";
+  sops.secrets.machineId.mode = "0444";
 
   fileSystems."/persist".neededForBoot = true;
 
   environment = {
     impermanence.enable = true;
 
-    etc."machine-id".source = pkgs.runCommandLocal "machine-id-link" { } ''
-      ln -s ${config.sops.secrets."machineId".path} $out
+    etc.machine-id.source = pkgs.runCommandLocal "machine-id-link" { } ''
+      ln -s ${config.sops.secrets.machineId.path} $out
     '';
 
     persistence = {