prom.nix

let
  pkgs = import <nixpkgs> {};

  configFile = pkgs.writeText "prometheus.yml" (builtins.toJSON {
      global.scrape_interval = "30s";
      scrape_configs = [
        {
          job_name = "weather-berkshires-ma";
          metrics_path = "/weather";
          params = {
            latitude = [ "42.45" ];
            longitude = [ "-73.25" ];
          };
          scheme = "https";
          static_configs = [
            {
              labels = {};
              targets = [ "weather.gsc.io" ];
            }
          ];
        }
        {
          job_name = "weather-nyc-ny";
          metrics_path = "/weather";
          params = {
            latitude = [ "40.75" ];
            longitude = [ "-73.98" ];
          };
          scheme = "https";
          static_configs = [
            {
              labels = {};
              targets = [ "weather.gsc.io" ];
            }
          ];
        }
      ];
  });
in pkgs.dockerTools.buildLayeredImage {
  name = "prometheus";
  tag = "latest";
  contents = [ pkgs.cacert ];
  config.User = "1000";
  config.Entrypoint = [ "${pkgs.prometheus}/bin/prometheus" ];
  config.Cmd = [
    "--storage.tsdb.path=/data"
    "--config.file=${configFile}"
  ];
}