modules/nixos/monitoring: add loki, modules/nixos/common: add promtail

[zowoq]

No description provided.

[Mic92]

It took me a while to find sane loki configuration:

https://github.com/Mic92/dotfiles/blob/c912c73266f10973106a8522cbec827e2802918d/nixos/eva/modules/loki.nix#L39

[zowoq]

We've been doing okay without this so far and at the moment it seems like it may not be worth the effort, may need to reconsider if we end up adding more hosts or we start buying our own hardware.

[zowoq]

Going to take another look at collecting logs, either with loki or maybe victorialogs.

---

https://grafana.com/docs/loki/latest/send-data/promtail/
Promtail is now deprecated and will enter into Long-Term Support (LTS) beginning Feb. 13, 2025. This means that Promtail will no longer receive any new feature updates, but it will receive critical bug fixes and security fixes. Commercial support will end after the LTS phase, which we anticipate will extend for about 12 months until February 28, 2026. End-of-Life (EOL) phase for Promtail will begin once LTS ends. Promtail is expected to reach EOL on March 2, 2026, afterwards no future support or updates will be provided. All future feature development will occur in Grafana Alloy.

@Mic92 Have you any plans for moving off promtail?