we can use unstable prometheus now

flake.lock

@@ -126,11 +126,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1735947440,
-        "narHash": "sha256-jnEcfmOhWntmVEcqlvs+j532+mvmgsKtQSSfukgkn+A=",
+        "lastModified": 1736013363,
+        "narHash": "sha256-P4lsS2Y5GzBfC8OfXtD/xWEucX6oHGTjOzjEjEJbXfc=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "a9987622b7b93c82e147f198574e8e6ffbf5e327",
+        "rev": "0d7908bd09165db6699908b7e3970f137327cbf0",
         "type": "github"
       },
       "original": {
@@ -230,22 +230,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-stable_2": {
-      "locked": {
-        "lastModified": 1735669367,
-        "narHash": "sha256-tfYRbFhMOnYaM4ippqqid3BaLOXoFNdImrfBfCp4zn0=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "edf04b75c13c2ac0e54df5ec5c543e300f76f1c9",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixos-24.11",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "pre-commit-hooks-nix": {
       "inputs": {
         "flake-compat": [
@@ -281,7 +265,6 @@
         "nixpkgs": "nixpkgs",
         "nixpkgs-borg": "nixpkgs-borg",
         "nixpkgs-btrbk": "nixpkgs-btrbk",
-        "nixpkgs-stable": "nixpkgs-stable_2",
         "sops-nix": "sops-nix",
         "treefmt": "treefmt"
       }