nixpkgs/nixos/tests/telegraf.nix

{ pkgs, ... }:
{
  name = "telegraf";
  meta = with pkgs.lib.maintainers; {
    maintainers = [ mic92 ];
  };

  nodes.machine =
    { ... }:
    {
      services.telegraf.enable = true;
      services.telegraf.environmentFiles = [
        (pkgs.writeText "secrets" ''
          SECRET=example
        '')
      ];
      services.telegraf.extraConfig = {
        agent.interval = "1s";
        agent.flush_interval = "1s";
        inputs.exec = {
          commands = [
            "${pkgs.runtimeShell} -c 'echo $SECRET,tag=a i=42i'"
          ];
          timeout = "5s";
          data_format = "influx";
        };
        inputs.ping = {
          urls = [ "127.0.0.1" ];
          count = 4;
          interval = "10s";
          timeout = 1.0;
        };
        outputs.file.files = [ "/tmp/metrics.out" ];
        outputs.file.data_format = "influx";
      };
    };

  testScript = ''
    start_all()

    machine.wait_for_unit("telegraf.service")
    machine.wait_until_succeeds("grep -q example /tmp/metrics.out")
    machine.wait_until_succeeds("grep -q ping /tmp/metrics.out")
  '';
}