stats cmd should be robust enough to handle metrics with multiple lab…

…els (#4941)

Signed-off-by: Changxin Miao <miaochangxin@step.ai>

cmd/stats.go

@@ -360,10 +360,11 @@ func readStats(mp string) map[string]float64 {
  for _, line := range lines {
  fields := strings.Fields(line)
  if len(fields) == 2 {
- stats[fields[0]], err = strconv.ParseFloat(fields[1], 64)
+ v, err := strconv.ParseFloat(fields[1], 64)
  if err != nil {
  logger.Warnf("parse %s: %s", fields[1], err)
  }
+ stats[fields[0]] += v
  }
  }
  return stats