anchor.diff:  
     circonus-gometrics = buildFromGitHub {
       version = 2;
  -    date = "2017-02-09";
  -    rev = "61bd3320eb4dbe36c3e5d6b8de6069d719c1d05b";
  +    date = "2017-02-21";
  +    rev = "dbab9a33438e3f8317407ef5d3a51c29340541db";
       owner  = "circonus-labs";
       repo   = "circonus-gometrics";
  -    sha256 = "0lp5jpv29jzsz2gd3ccclja54f6wah4cpk433s2b1jms2ssdw0dp";
  +    sha256 = "19gc4p5n47axnypxss70as03fbvb0mb06zii5xiq3s6sv5hf6lf7";
       propagatedBuildInputs = [
         circonusllhist
         go-retryablehttp
  
positive.code: 
    prometheus_client_golang = buildFromGitHub {
      version = 2;
      rev = "6ab3432d241cbe3cb7543da7e7e9a934c7e9fe76";
      owner = "prometheus";
      repo = "client_golang";
      sha256 = "0rh5f68vjf6l5crjiv7g7l3py71mcif0mf6apxr6h33rq398rh6c";
      propagatedBuildInputs = [
        goautoneg
        net
  
negative.code:       net
        protobuf
      ];
      date = "2017-02-24";
    };
  
    ewma = buildFromGitHub {
  