systemd.go: Used TrimLeft instead of regex for boot times metrics. (#124

)

Signed-off-by: Jonathan Davies <[email protected]>

systemd/systemd.go

@@ -44,7 +44,6 @@ var (
 	systemdUser               = kingpin.Flag("systemd.collector.user", "Connect to the user systemd instance.").Bool()
 	enableRestartsMetrics     = kingpin.Flag("systemd.collector.enable-restart-count", "Enables service restart count metrics. This feature only works with systemd 235 and above.").Bool()
 	enableIPAccountingMetrics = kingpin.Flag("systemd.collector.enable-ip-accounting", "Enables service ip accounting metrics. This feature only works with systemd 235 and above.").Bool()
-	bootTimeRE                = regexp.MustCompile(`\d+`)
 )
 
 var unitStatesName = []string{"active", "activating", "deactivating", "inactive", "failed"}
@@ -366,15 +365,12 @@ func (c *Collector) collectBootStageTimestamps(conn *dbus.Conn, ch chan<- promet
 		stageMonotonic := strings.TrimPrefix(strings.TrimSuffix(stageMonotonicValue, `"`), `"`)
 		stageTimestamp := strings.TrimPrefix(strings.TrimSuffix(stageTimestampValue, `"`), `"`)
 
-		parsedStageMonotonic := bootTimeRE.FindString(stageMonotonic)
-		parsedStageTime := bootTimeRE.FindString(stageTimestamp)
-
-		vMonotonic, err := strconv.ParseFloat(parsedStageMonotonic, 64)
+		vMonotonic, err := strconv.ParseFloat(strings.TrimLeft(stageMonotonic, "@t "), 64)
 		if err != nil {
 			return err
 		}
 
-		vTimestamp, err := strconv.ParseFloat(parsedStageTime, 64)
+		vTimestamp, err := strconv.ParseFloat(strings.TrimLeft(stageTimestamp, "@t "), 64)
 		if err != nil {
 			return err
 		}