bitcoin/doc/release-notes-15492.md

Deprecated or removed RPCs

• The wallet's generate RPC method was deprecated in v0.18 and has now been fully removed. This RPC is only used for testing, but its implementation reached across multiple subsystems (wallet and mining), so it has been removed to simplify the wallet-node interface. Projects that are using generate for testing purposes should transition to using the generatetoaddress RPC, which does not require or use the wallet component. Calling generatetoaddress with an address returned by the getnewaddress RPC gives the same functionality as the old generate RPC.