https://travis-ci.org/github/bitcoin/bitcoin/jobs/680452476#L6107
UniValue failbucket(UniValue::VOBJ);
        failbucket.pushKV("startrange", round(buckets.fail.start));
        failbucket.pushKV("endrange", round(buckets.fail.end));
        failbucket.pushKV("withintarget", round(buckets.fail.withinTarget * 100.0) / 100.0);
        failbucket.pushKV("totalconfirmed", round(buckets.fail.totalConfirmed * 100.0) / 100.0);
        failbucket.pushKV("inmempool", round(buckets.fail.inMempool * 100.0) / 100.0);
        failbucket.pushKV("leftmempool", round(buckets.fail.leftMempool * 100.0) / 100.0);
        
        if (feeRate != CFeeRate(0)) {
            horizon_result.pushKV("feerate", ValueFromAmount(feeRate.GetFeePerK()));
            horizon_result.pushKV("decay", buckets.decay);
            horizon_result.pushKV("scale", (int)buckets.scale);
            horizon_result.pushKV("pass", passbucket);
            
            if (buckets.fail.start != -1) horizon_result.pushKV("fail", failbucket);
        } else {
            
            horizon_result.pushKV("decay", buckets.decay);
            horizon_result.pushKV("scale", (int)buckets.scale);
            horizon_result.pushKV("fail", failbucket);
            errors.push_back("Insufficient data or no feerate found which meets threshold");
            horizon_result.pushKV("errors",errors);
        }
        result.pushKV(StringForFeeEstimateHorizon(horizon), horizon_result);
    }
    return result;
},
    };
}
void RegisterMiningRPCCommands(CRPCTable &t)