docs: public void closeStaleConnections() {
  
          logger.debug("closeStaleConnections() count before expiring: {}", getConnectionCount());
  
          Set<ConnectionKey> stale = getStaleConnectionKeys();
  
          for (ConnectionKey connectionKey : stale) {
              connectionProvider.close(connectionKey);
          }
  
          logger.debug("closeStaleConnections() count after expiring: {}", getConnectionCount());
      }