From b9ff57c59e3705eb963d39001192ab3a0ecd2d1e Mon Sep 17 00:00:00 2001
From: gary rong <garyrong0905@gmail.com>
Date: Thu, 19 Nov 2020 04:50:11 +0800
Subject: [PATCH] metrics: fix the panic for reading empty cpu stats (#21864)

---
 metrics/cpu_enabled.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/metrics/cpu_enabled.go b/metrics/cpu_enabled.go
index 52a3c2e96..02192928b 100644
--- a/metrics/cpu_enabled.go
+++ b/metrics/cpu_enabled.go
@@ -31,6 +31,10 @@ func ReadCPUStats(stats *CPUStats) {
 		log.Error("Could not read cpu stats", "err", err)
 		return
 	}
+	if len(timeStats) == 0 {
+		log.Error("Empty cpu stats")
+		return
+	}
 	// requesting all cpu times will always return an array with only one time stats entry
 	timeStat := timeStats[0]
 	stats.GlobalTime = int64((timeStat.User + timeStat.Nice + timeStat.System) * cpu.ClocksPerSec)