Add support for hex values

exporter/collector.go

@@ -17,6 +17,8 @@ import (
 	"bytes"
 	"encoding/json"
 	"time"
+	"math/big"
+	"strings"
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
@@ -91,6 +93,11 @@ func (mc JSONMetricCollector) Collect(ch chan<- prometheus.Metric) {
 						continue
 					}
 
+					// When value starts by '0x', convert hex to decimal
+					if strings.HasPrefix(value, "0x") {
+						value = formatHex(value)
+						}
+
 					if floatValue, err := SanitizeValue(value); err == nil {
 						metric := prometheus.MustNewConstMetric(
 							m.Desc,
@@ -178,3 +185,11 @@ func timestampMetric(logger log.Logger, m JSONMetric, data []byte, pm prometheus
 	timestamp := time.UnixMilli(epochTime)
 	return prometheus.NewMetricWithTimestamp(timestamp, pm)
 }
+
+func formatHex(s string) string {
+	st := strings.Replace(s, "0x", "", -1)
+	i := new(big.Int)
+	i.SetString(st, 16)
+	str := i.String()
+	return str
+}