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feat: add NATS cache sharing and smart cache refresh

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Add two complementary features to reduce remote revision cache staleness:

1. Smart local cache: When current system revision matches cached remote
   revision, force an immediate cache refresh to check for newer revisions.

2. NATS integration: Share cache updates across hosts via NATS pub/sub.
   Hosts publish revision updates when they fetch new data, and subscribe
   to receive updates from other hosts. Features include:
   - Auto-reconnect with infinite retries
   - Graceful fallback when NATS unavailable
   - Filtering by flake URL and hostname

New CLI flags:
  --flake.nats.enable
  --flake.nats.url
  --flake.nats.subject
  --flake.nats.credentials-file

New NixOS module options under services.prometheus.exporters.nixos.flake.nats

Bumps version to 0.3.0.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Torjus Håkestad
2026-02-08 23:05:52 +01:00
parent cf0ce85899
commit 5cc0e7eadd
7 changed files with 315 additions and 18 deletions
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flake.nix
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@@ -26,7 +26,7 @@
pname = "nixos-exporter";
inherit version;
src = ./.;
vendorHash = "sha256-NnvB20rORPS5QF5enbb5KpWaKZ70ybSgfd7wjk21/Cg=";
vendorHash = "sha256-AVtGXeAmbc6ePLZgayWiqnGxxgg0ON1uG5ZzTjLjdwQ=";
meta = with pkgs.lib; {
description = "Prometheus exporter for NixOS-specific metrics";