docs: function(memory) {
          var memoryHistory = this.get('memory');
  
          if (!memoryHistory) {
              memoryHistory = [];
              this.set({
                  memory: memoryHistory
              });
          }
  
          memoryHistory.push(memory);
          while (memoryHistory.length > this._statHistory) {
              memoryHistory.shift();
          }
  
          var avg = 0;
          memoryHistory.filter(function(f) {
              return f !== null;
          }).forEach(function(f) {
              avg += f;
          });
          avg /= memoryHistory.length;
          this.set({
              avgMemory: Math.round(avg)
          });
      }