metrics alert: fix apply cpu alert (#11672)
metrics alert: fix apply cpu alert (#11672)

Signed-off-by: zhangjinpeng1987 <zhangjinpeng@pingcap.com>

Co-authored-by: Ti Chi Robot <040e6455cde1c91e876ec337e785ce913eacba35@tidb.io>
BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv