Torjus Håkestad 04eba77ac0 fix: use nixos-version --json for configuration revision ...

- Use `nixos-version --json` command instead of reading files directly
- Add nixpkgs_rev and nixos_version labels to nixos_flake_info metric
- Show "unknown" for current_rev when system.configurationRevision not set
- Document configurationRevision setup in README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-07 00:55:23 +01:00

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