infrastructure/modules/system/exports/monitoring.nix

{
  lib,
  gensokyo-zone,
  ...
}: let
  inherit (gensokyo-zone.lib) mapAlmostOptionDefaults mkAlmostOptionDefault;
  inherit (lib.modules) mkIf;
in {
  config.exports.services = {
    prometheus = {config, ...}: {
      id = mkAlmostOptionDefault "prometheus";
      nixos = {
        serviceAttr = "prometheus";
        assertions = mkIf config.enable [
          (nixosConfig: {
            assertion = config.ports.default.port == nixosConfig.services.prometheus.port;
            message = "port mismatch";
          })
        ];
      };
      ports.default = mapAlmostOptionDefaults {
        port = 9090;
        protocol = "http";
      };
    };
    prometheus-exporters-node = {config, ...}: {
      id = mkAlmostOptionDefault "prometheus-exporters-node";
      nixos = {
        serviceAttrPath = ["services" "prometheus" "exporters" "node"];
        assertions = mkIf config.enable [
          (nixosConfig: {
            assertion = config.ports.default.port == nixosConfig.services.prometheus.exporters.node.port;
            message = "port mismatch";
          })
        ];
      };
      ports.default = mapAlmostOptionDefaults {
        port = 9091;
        protocol = "http";
      };
    };
    grafana = {config, ...}: {
      id = mkAlmostOptionDefault "grafana";
      nixos = {
        serviceAttr = "grafana";
        assertions = mkIf config.enable [
          (nixosConfig: {
            assertion = config.ports.default.port == nixosConfig.services.grafana.settings.server.http_port;
            message = "port mismatch";
          })
        ];
      };
      ports.default = mapAlmostOptionDefaults {
        port = 9092;
        protocol = "http";
      };
    };
    loki = {config, ...}: {
      id = mkAlmostOptionDefault "loki";
      nixos = {
        serviceAttr = "loki";
        assertions = mkIf config.enable [
          (nixosConfig: {
            assertion = config.ports.default.port == nixosConfig.services.loki.settings.httpListenPort;
            message = "port mismatch";
          })
        ];
      };
      ports.default = mapAlmostOptionDefaults {
        port = 9093;
        protocol = "http";
      };
    };
    promtail = {config, ...}: {
      id = mkAlmostOptionDefault "promtail";
      nixos = {
        serviceAttr = "promtail";
        assertions = mkIf config.enable [
          (nixosConfig: {
            assertion = config.ports.default.port == nixosConfig.services.promtail.settings.httpListenPort;
            message = "port mismatch";
          })
        ];
      };
      ports.default = mapAlmostOptionDefaults {
        port = 9094;
        protocol = "http";
      };
    };
  };
}