https://travis-ci.org/github/bitcoin/bitcoin/jobs/680452476#L6107
{RPCResult::Type::NUM, "scale", "The resolution of confirmation targets at this time horizon"},
                                {RPCResult::Type::OBJ, "pass",  true, "information about the lowest range of feerates to succeed in meeting the threshold",
                                {
                                        {RPCResult::Type::NUM, "startrange", "start of feerate range"},
                                        {RPCResult::Type::NUM, "endrange", "end of feerate range"},
                                        {RPCResult::Type::NUM, "withintarget", "number of txs over history horizon in the feerate range that were confirmed within target"},
                                        {RPCResult::Type::NUM, "totalconfirmed", "number of txs over history horizon in the feerate range that were confirmed at any point"},
                                        {RPCResult::Type::NUM, "inmempool", "current number of txs in mempool in the feerate range unconfirmed for at least target blocks"},
                                        {RPCResult::Type::NUM, "leftmempool", "number of txs over history horizon in the feerate range that left mempool unconfirmed after target"},
                                }},
                                {RPCResult::Type::OBJ, "fail",  true, "information about the highest range of feerates to fail to meet the threshold",
                                {
                                    {RPCResult::Type::ELISION, "", ""},
                                }},
                                {RPCResult::Type::ARR, "errors",  true, "Errors encountered during processing (if there are any)",
                                {
                                    {RPCResult::Type::STR, "error", ""},
                                }},
                        }},
                        {RPCResult::Type::OBJ, "medium",  true, "estimate for medium time horizon",
                        {
                            {RPCResult::Type::ELISION, "", ""},
                        }},
                        {RPCResult::Type::OBJ, "long",  true, "estimate for long time horizon",
                        {
                            {RPCResult::Type::ELISION, "", ""},
                        }},
                    }},
                RPCExamples{
                    HelpExampleCli("estimaterawfee", "6 0.9")