code: public SyntheticsAlertConditionCache syntheticsAlertConditions(long policyId)
      {
          SyntheticsAlertConditionCache cache = syntheticsConditions.get(policyId);
          if(cache == null)
              syntheticsConditions.put(policyId, cache = new SyntheticsAlertConditionCache(policyId));
          return cache;
      }
docs: Returns the cache of Synthetics alert conditions for the given policy, creating one if it doesn't exist .
  @param policyId The id of the policy for the cache of Synthetics alert conditions
  @return The cache of Synthetics alert conditions for the given policy