infra/services/monitoring/promtail.nix

{
  config,
  lib,
  ...
}:
let
  cfg = config.bagel.monitoring.promtail;
  inherit (lib) mkEnableOption mkIf;
in
{
  options.bagel.monitoring.promtail.enable = (mkEnableOption "Promtail log export") // { default = true; };

  config = mkIf cfg.enable {
    age.secrets.promtail-password = {
      file = ../../secrets/metrics-push-password.age;
      owner = "promtail";
    };

    services.promtail = {
      enable = true;
      configuration = {
        server.disable = true;
        clients = [ 
          {
            url = "https://loki.forkos.org/loki/api/v1/push";
            basic_auth = {
              username = "promtail";
              password_file = config.age.secrets.promtail-password.path;
            };
          }
        ];
        scrape_configs = [
          {
            job_name = "system";
            journal = {
              max_age = "12h";
              labels = {
                job = "systemd-journal";
                host = config.networking.hostName;
              };
            };
            relabel_configs = [
              {
                source_labels = [ "__journal__systemd_unit" ];
                target_label = "unit";
              }
            ];
          }
        ];
      };
    };
  };
}