docs: public long getPollHeartbeatInterval() {
  
          int  retries  = getPollHeartbeatRetries();
          long interval = 10 + (HEARTBEAT_INTERVAL_PADDED / retries);
  
          try {
              interval = Long.getLong(POLL_INTERVAL_PROPERTY,
                                      interval).longValue();
          } catch (Exception e) {}
  
          if (interval <= 0) {
              interval = 10 + (HEARTBEAT_INTERVAL_PADDED / retries);
          }
  
          return interval;
      }