lower the probability of marking living monkeys as dead

living monkeys will now be auto-marked as dead only if not a single
living monkey sent keep-alive in the last 10 minutes

monkey_island/cc/main.py

@@ -296,6 +296,11 @@ def output_json(obj, code, headers=None):
 
 
 def update_dead_monkeys():
+
+    # Update dead monkeys only if no living monkey transmitted keepalive in the last 10 minutes
+    if mongo.db.monkey.find_one({'dead': {'$ne': True}, 'keepalive': {'$gte': datetime.now() - timedelta(minutes=10)}}):
+        return
+
     mongo.db.monkey.update(
         {'keepalive': {'$lte': datetime.now() - timedelta(minutes=10)}, 'dead': {'$ne': True}},
         {'$set': {'dead': True, 'modifytime': datetime.now()}}, upsert=False, multi=True)