- The `-sendfreetransactions` option has been removed, since almost all miners do not include transactions which do not attach a transaction fee.

- The `-blockprioritysize` option has been removed.

- The `estimatepriority` and `estimatesmartpriority` RPCs have been removed.

- The `prioritisetransaction` RPC no longer takes a `priority_delta` argument, which is replaced by a `dummy` argument for backwards compatibility with clients using positional arguments. The RPC is still used to change the apparent fee-rate of the transaction by using the `fee_delta` argument.

- `-minrelaytxfee` can now be set to 0. If `minrelaytxfee` is set, then fees smaller than `minrelaytxfee` (per kB) are rejected from relaying, mining and transaction creation. This defaults to 1000 satoshi/kB.

- The `-printpriority` option has been updated to only output the fee rate and hash of transactions included in a block by the mining code.

- `maximumCount` - a number specifying the minimum number of UTXOs

- `minimumSumAmount` - a number specifying the minimum sum value of all UTXOs

- The `dumpwallet` RPC now returns the full absolute path to the dumped wallet. It

used to return no value, even if successful (See [PR 9740](https://github.com/bitcoin/bitcoin/pull/9740)).