This update is backwards compatible with v1.4.0 and v1.4.1. The changes in the upgrade go into effect at 10 AM EDT, May 5th 2021 on the Fuji testnet and 7 AM EDT, May 10th 2021 on mainnet. The patch further reduces the size of gossiped peerlist messages and introduces several new flags.
network-peer-list-sizeallows for tuning the number of peers gossiped in eachpeerlistmessage.network-peer-list-gossip-sizeallows for tuning the number of peers to gossippeerlistmessages to.network-peer-list-gossip-frequencyallows for tuning how frequentlypeerlists are gossiped.