anchor.diff:            Open port in firewall for incoming connections.
           '';
         };
  +
  +      extraFlags = mkOption {
  +        type = types.listOf types.str;
  +        default = [];
  +        description = ''
  +          Extra commandline options when launching the Alertmanager.
  +        '';
  +      };
       };
     };
   
  
positive.code:     if cfg.configText != null then
        pkgs.writeText "alertmanager.yml" cfg.configText
      else mkConfigFile;
  in {
    options = {
      services.prometheus.alertmanager = {
  
negative.code:       after    = [ "network.target" ];
        script = ''
          ${pkgs.prometheus-alertmanager.bin}/bin/alertmanager \
            ${concatStringsSep " \\\n  " cmdlineArgs}
        '';
  
        serviceConfig = {
  