/*
The callback function applied to each probe, its responsibility is to
return the results back to the appropriate collection system.
function update_stats(data)
{
  var timenow = parseInt(new Date().getTime() / 1000);
  for (var v in data) {
    switch (config.output_format) {
    case 'console':
      console.log([[os.hostname(), v].join('.'), data[v], timenow].join(' '));
      break;
    case 'graphite':
      console.log([[os.hostname(), v].join('.'), data[v], timenow].join(' '));
      break;
    case 'rrd-simple':
      /*
       * rrd-simple doesn't support sub-minute granularity, and RRD is
       * notoriously bad at being able to sample accurate data, so we round to
       * the nearest minute.
       */
      var off = timenow % 60;
      timenow = (off <= 30) ? timenow - off : timenow + (60 - off);
      /*
       * POST data
       */
      var data = [[timenow, v].join('.'), data[v]].join(' ');
      var http = require('http');
      var opts = {
        host: config.rrdsimple.host,
        port: config.rrdsimple.port,
        path: config.rrdsimple.path,
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded',
          'Content-Length': data.length
        }
      }
      console.log('[' + new Date().toISOString() + '] ' +
                  [timenow, v].join('.') + ' -> ' + opts['host']);
      var req = http.request(opts, function (res) {
        // We currently fire-and-forget..
      }).write(data);
      break;
    }
  }
}