pkg/metrics: protect global vars in reset func
pkg/metrics: protect global vars in reset func

armstrongli/etcd,lorneli/etcd,axingblog/etcd,ravigadde/etcd,onlyjob/etcd,sofuture/etcd,OyTao/etcd_learning,fanminshi/etcd,mqliang/etcd,ecnahc515/etcd,lumjjb/etcd,snailwalker/etcd,jmptrader/etcd,YuleiXiao/etcd,swingbach/etcd,lorneli/etcd,xiang90/etcd,gouyang/etcd,coreos/etcd,wantonsolutions/dinv-etcd,whuwxl/etcd,gyuho/etcd,junxu/etcd,giantswarm/etcd,siddontang/etcd,buaazp/etcd,yyljlyy/etcd,es-chow/etcd,rchicoli/etcd,olark/etcd,njharman/etcd,cognusion/etcd,sayden/etcd,rnaveiras/etcd,mgoelzer/etcd-fork2,westhood/etcd,shafreeck/etcd,kingland/etcd,shakefu/etcd,insequent/etcd,xychu/etcd,TheHippo/etcd,fasaxc/etcd,Yhgenomics/etcd,achanda/etcd,handsomesun/etcd,arthurcolle/etcd,betawaffle/etcd,Eagle-X/etcd,hroyrh/etcd,nieanan/etcd,bluebreezecf/etcd,combk8s/etcd,etcd-io/etcd,jlamillan/etcd,mitake/etcd,luxas/etcd,swingbach/etcd,jonboulle/etcd,akauppi/etcd,giantswarm/etcd,justintung/etcd,glycerine/etcd,plasticbox/etcd,improbable-io/etcd,vimalk78/etcd,qqsun8819/etcd,mwitkow-io/etcd,jonboulle/etcd,betawaffle/etcd,rnaveiras/etcd,bdarnell/etcd,tangkun75/etcd,wowsoso/etcd,svdata/etcd,elimisteve/etcd,ktateish/etcd,SivagnanamCiena/etcd,njucslqq/etcd,OyTao/etcd_learning,rnaveiras/etcd,hpcloud/etcd,tguangch/etcd,lumjjb/etcd,hroyrh/etcd,sebrandon1/etcd,iamqizhao/etcd,tguangch/etcd,devfreesg/etcd,yichengq/etcd,nekto0n/etcd,HideoYamauchi/etcd,Winslett/etcd,dannysauer/etcd,shafreeck/etcd,hongchaodeng/etcd,chenbaihu/etcd,nekto0n/etcd,ajityagaty/etcd,bdarnell/etcd,joshix/etcd,mqliang/etcd,spacejam/etcd,wfxiang08/etcd,junxu/etcd,tangkun75/etcd,pauldallen/etcd,li-ang/etcd,fanminshi/etcd,msanterre/etcd,nieanan/etcd,mickep76/etcd,bspline/etcd,combk8s/etcd,jravetch/etcd,Winslett/etcd,bspline/etcd,mwitkow/etcd,wantonsolutions/dinv-etcd,xueshanf/etcd,yifan-gu/etcd,mgoelzer/etcd-fork2,fasaxc/etcd,zaphod-concur/etcd,dannysauer/etcd,zaphod-concur/etcd,gyuho/etcd,fgbreel/etcd,ecnahc515/etcd,msanterre/etcd,pengzj/etcd,mkumatag/etcd,ylong/etcd,wantonsolutions/dinv-etcd,princeqjzh/etcd,lzbgt/etcd,endocode/etcd,nkhare/etcd,tamird/etcd,njharman/etcd,jefby/etcd,a-robinson/etcd,hongbinz/etcd,yyljlyy/etcd,dalanlan/etcd,justintung/etcd,crandles/etcd,ravigadde/etcd,mike-lerch/etcd,svdata/etcd,oscarrr110/etcd,jravetch/etcd,freeloop1114/etcd,barakmich/etcd,tamird/etcd,etcd-io/etcd,delkyd/etcd,qiaochao911/etcd,mickep76/etcd,CrazyJvm/etcd,Yhgenomics/etcd,oscarrr110/etcd,bakins/etcd,dalanlan/etcd,sinsharat/etcd,mischief/etcd,pauldallen/etcd,gtank/etcd,asim/etcd,lzbgt/etcd,onlyjob/etcd,akauppi/etcd,fasaxc/etcd,es-chow/etcd,mischief/etcd,yudai/etcd,jeremyeder/etcd,sebschrader/etcd,ylong/etcd,njucslqq/etcd,plasticbox/etcd,li-ang/etcd,siddontang/etcd,asim/etcd,elimisteve/etcd,ajityagaty/etcd,yudai/etcd,mwitkow-io/etcd,qqsun8819/etcd,csuideal/etcd,steveeJ/etcd,barakmich/etcd,HideoYamauchi/etcd,dnaeon/etcd,kkaneda/etcd,fgbreel/etcd,dnaeon/etcd,xdlinear/etcd,shakefu/etcd,jefby/etcd,CrazyJvm/etcd,wfxiang08/etcd,cockroachdb/etcd,whuwxl/etcd,insequent/etcd,cognusion/etcd,achanda/etcd,pengzj/etcd,bakins/etcd,gouyang/etcd,Timer/etcd,QuantiumTechnology/etcd,yifan-gu/etcd,mwitkow/etcd,StorReduce/etcd,SivagnanamCiena/etcd,axingblog/etcd,snailwalker/etcd,StorReduce/etcd,mqliang/etcd,gityf/etcd,xychu/etcd,ajityagaty/etcd,jchauncey/etcd,olark/etcd,gityf/etcd,chenbaihu/etcd,beni55/etcd,improbable-io/etcd,coreos/etcd,mitake/etcd,gosharplite/etcd,openedbox/etcd,yichengq/etcd,delkyd/etcd,heyitsanthony/etcd,qiaochao911/etcd,xebitstudios/etcd,openedbox/etcd,princeqjzh/etcd,imzhulei/etcd,visheshnp/etcd,insionng/etcd,hpcloud/etcd,offscale/etcd,beni55/etcd,shawnps/etcd,linuxcer/etcd,gtank/etcd,heyitsanthony/etcd,mkumatag/etcd,freeloop1114/etcd,mkumatag/etcd,rchicoli/etcd,endocode/etcd,iamqizhao/etcd,sofuture/etcd,purpleidea/etcd,gae123/etcd,offscale/etcd,raoofm/etcd,luxas/etcd,hzy001/etcd,sinsharat/etcd,purpleidea/etcd,steveeJ/etcd,insionng/etcd,youxidev/etcd,nkhare/etcd,ktateish/etcd,tempbottle/etcd,hongchaodeng/etcd,QuantiumTechnology/etcd,joshix/etcd,honeyqa/etcd,YuleiXiao/etcd,mike-lerch/etcd,tempbottle/etcd,xdlinear/etcd,TheHippo/etcd,polvi/etcd,jchauncey/etcd,glevand/coreos--etcd,gae123/etcd,kingland/etcd,etcd-io/etcd,Timer/etcd,xiang90/etcd,raoofm/etcd,xebitstudios/etcd,bluebreezecf/etcd,buaazp/etcd,wowsoso/etcd,arthurcolle/etcd,hongbinz/etcd,glevand/coreos--etcd,cockroachdb/etcd,glycerine/etcd,honeyqa/etcd,chipironcin/etcd,jlamillan/etcd,cchamplin/etcd,youxidev/etcd,crandles/etcd,sebschrader/etcd,chipironcin/etcd,jeremyeder/etcd,devfreesg/etcd,kkaneda/etcd,imzhulei/etcd,gosharplite/etcd,armstrongli/etcd,visheshnp/etcd,hzy001/etcd,linuxcer/etcd,glensc/etcd,xueshanf/etcd,jmptrader/etcd,spacejam/etcd,sayden/etcd,polvi/etcd,westhood/etcd,a-robinson/etcd,csuideal/etcd,vimalk78/etcd,glensc/etcd,Eagle-X/etcd,shawnps/etcd,cchamplin/etcd,sebrandon1/etcd,handsomesun/etcd