anchor.diff:  
       web = {
         enable = mkOption {
  -        description = "Whether to enable graphite web frontend";
  +        description = "Whether to enable graphite web frontend.";
           default = false;
           type = types.uniq types.bool;
         };
   
         host = mkOption {
  -        description = "Graphite web frontend listen address";
  +        description = "Graphite web frontend listen address.";
           default = "127.0.0.1";
           type = types.str;
         };
   
         port = mkOption {
  -        description = "Graphite web frontend port";
  +        description = "Graphite web frontend port.";
           default = 8080;
           type = types.int;
         };
  
positive.code:       };
  
        enableRelay = mkOption {
          description = "Whether to enable carbon relay, the carbon replication and sharding service";
          default = false;
          type = types.uniq types.bool;
        };
  
negative.code: 
      carbon = {
        config = mkOption {
          description = "Content of carbon configuration file.";
          default = ''
            [cache]
            # Listen on localhost by default for security reasons
  