https://forum.dfinity.org/t/proposal-139083-to-upgrade-migration-canister/59285
Exchange rate canister upgrade proposal 139107 : https://forum.dfinity.org/t/proposal-139107-to-upgrade-the-exchange-rate-canister/59334
Cycles-ledger index canister re-install proposal 139236 : https://forum.dfinity.org/t/proposal-139236-to-re-install-the-cycles-ledger-index-canister/59524