public long getRetryWindowMs(String systemName) {
    return getLong(String.format(CONFIG_RETRY_WINDOW_MS, systemName), DEFAULT_CONFIG_RETRY_WINDOW_MS);
  }
Get the sliding window size in ms for tracking the retry count
@param systemName name of the system
@return long, sliding window size in ms
samza-azure/src/main/java/org/apache/samza/system/eventhub/EventHubConfig.java