public void setRetryDelayFunction(final RetryDelayFunction retryDelayFunction) {
    this.retryDelayFunction = retryDelayFunction;
  }
Returns a copy of the known peers. Modifications to the list will not update the table's state,
but modifications to the Peers themselves will.

@return List of peers.
ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/discovery/internal/PeerDiscoveryController.java