code: function executorSummary(computers) {
  
    var data = {};
  
    computers.forEach(function (computer) {
  
      var idleCount   = 0;
      var activeCount = 0;
  
      data[computer.displayName] = { executors: [] };
  
      computer.executors.forEach(function (executor) {
        data[computer.displayName].executors.push({
          idle: executor.idle,
          stuck: executor.likelyStuck,
          progress: executor.progress,
          name: (!executor.idle && executor.currentExecutable.url) ?
            executor.currentExecutable.url.replace(/.*\/job\//, '').replace(/\/.*/, '') :
            undefined
        });
  
        if (executor.idle) {
          idleCount += 1;
        } else {
          activeCount += 1;
        }
      });
  
      var summary = [];
      if (activeCount > 0) {
        summary.push(text.__('%d active', activeCount));
      }
      if (idleCount > 0) {
        summary.push(text.__('%d idle', idleCount));
      }
  
      data[computer.displayName].summary = summary.join(', ');
    });
  
    return data;
  }
docs: Summarise executor information from computers array.
  
  @param {Array} computers: computers array, part of Jenkins#computer result
  @return executor summary object