class_docstr: Simple class for tracking rule times and call count
class_docstr_tok: ["Simple","class","for","tracking","rule","times","and","call","count"]
code: def __add__(self, other):
      self.calls += 1
      self.tracked_time += other.tracked_time
      return self
  
file_path: streamalert/streamalert/shared/stats.py
imports: from collections import defaultdict
  import time
  from streamalert.shared.logger import get_logger
label_desc: Use image node_id 2 for calling the RuleStatistic obj's underlying member method code with example usage: obj.__add__(other) and returns: self