Add heartbeat and timeout threshold loggers.
Add heartbeat and timeout threshold loggers.

hroyrh/etcd,armstrongli/etcd,sofuture/etcd,li-ang/etcd,rnaveiras/etcd,chipironcin/etcd,mwitkow-io/etcd,Timer/etcd,jravetch/etcd,pauldallen/etcd,jlamillan/etcd,zaphod-concur/etcd,oscarrr110/etcd,luxas/etcd,chipironcin/etcd,arthurcolle/etcd,bdarnell/etcd,yichengq/etcd,hongchaodeng/etcd,glevand/coreos--etcd,svdata/etcd,tempbottle/etcd,gouyang/etcd,devfreesg/etcd,svdata/etcd,nekto0n/etcd,olark/etcd,jmptrader/etcd,njharman/etcd,fasaxc/etcd,cvik/etcd,glevand/coreos--etcd,hpcloud/etcd,jefby/etcd,akauppi/etcd,QuantiumTechnology/etcd,ajityagaty/etcd,handsomesun/etcd,westhood/etcd,axingblog/etcd,jonboulle/etcd,glensc/etcd,StorReduce/etcd,heyitsanthony/etcd,nkhare/etcd,insequent/etcd,kkaneda/etcd,fanminshi/etcd,yichengq/etcd,vimalk78/etcd,plasticbox/etcd,qqsun8819/etcd,raoofm/etcd,Ulexus/etcd,mkumatag/etcd,fasaxc/etcd,tguangch/etcd,tguangch/etcd,TheHippo/etcd,shafreeck/etcd,jravetch/etcd,iamqizhao/etcd,cvik/etcd,openedbox/etcd,barakmich/etcd,mischief/etcd,hzy001/etcd,bluebreezecf/etcd,Timer/etcd,lzbgt/etcd,achanda/etcd,es-chow/etcd,buaazp/etcd,sinsharat/etcd,ktateish/etcd,luxas/etcd,li-ang/etcd,jchauncey/etcd,princeqjzh/etcd,ylong/etcd,pengzj/etcd,mkumatag/etcd,pengzj/etcd,chenbaihu/etcd,mike-lerch/etcd,achanda/etcd,shakefu/etcd,dannysauer/etcd,Yhgenomics/etcd,giantswarm/etcd,cvik/etcd,mike-lerch/etcd,joshix/etcd,hongchaodeng/etcd,chenbaihu/etcd,barakmich/etcd,spacejam/etcd,csuideal/etcd,linuxcer/etcd,nkhare/etcd,csuideal/etcd,insequent/etcd,beni55/etcd,hpcloud/etcd,gouyang/etcd,YuleiXiao/etcd,siddontang/etcd,shawnps/etcd,openedbox/etcd,freeloop1114/etcd,gae123/etcd,wfxiang08/etcd,armstrongli/etcd,mwitkow/etcd,fasaxc/etcd,qiaochao911/etcd,delkyd/etcd,coreos/etcd,hroyrh/etcd,cognusion/etcd,mgoelzer/etcd-fork2,sayden/etcd,justintung/etcd,jmptrader/etcd,dannysauer/etcd,wantonsolutions/dinv-etcd,kingland/etcd,mickep76/etcd,rnaveiras/etcd,spotify/etcd,chai2010/etcd,offscale/etcd,robszumski/etcd,steveeJ/etcd,ajityagaty/etcd,betawaffle/etcd,polvi/etcd,snailwalker/etcd,etcd-io/etcd,raoofm/etcd,gyuho/etcd,mqliang/etcd,offscale/etcd,coreos/etcd,sebschrader/etcd,spacejam/etcd,bdarnell/etcd,crandles/etcd,jefby/etcd,pauldallen/etcd,Winslett/etcd,wfxiang08/etcd,OyTao/etcd_learning,TheHippo/etcd,honeyqa/etcd,shakefu/etcd,msanterre/etcd,sayden/etcd,glensc/etcd,Ulexus/etcd,mqliang/etcd,mkumatag/etcd,tangkun75/etcd,combk8s/etcd,princeqjzh/etcd,glycerine/etcd,Yhgenomics/etcd,zaphod-concur/etcd,akauppi/etcd,steveeJ/etcd,xiang90/etcd,insionng/etcd,asim/etcd,mqliang/etcd,cvik/etcd,Winslett/etcd,giantswarm/etcd,xychu/etcd,lumjjb/etcd,Ulexus/etcd,linuxcer/etcd,SivagnanamCiena/etcd,YuleiXiao/etcd,es-chow/etcd,tempbottle/etcd,njucslqq/etcd,xueshanf/etcd,improbable-io/etcd,cockroachdb/etcd,youxidev/etcd,qqsun8819/etcd,bluebreezecf/etcd,devfreesg/etcd,dterei/etcd,xiang90/etcd,ecnahc515/etcd,ylong/etcd,nieanan/etcd,asim/etcd,spotify/etcd,plasticbox/etcd,yudai/etcd,yyljlyy/etcd,improbable-io/etcd,imzhulei/etcd,rchicoli/etcd,kkaneda/etcd,visheshnp/etcd,QuantiumTechnology/etcd,ajityagaty/etcd,cognusion/etcd,shawnps/etcd,hongbinz/etcd,mickep76/etcd,etcd-io/etcd,CrazyJvm/etcd,lorneli/etcd,mitake/etcd,mwitkow-io/etcd,imzhulei/etcd,fanminshi/etcd,glycerine/etcd,swingbach/etcd,bspline/etcd,Ulexus/etcd,crandles/etcd,fgbreel/etcd,spotify/etcd,yifan-gu/etcd,SivagnanamCiena/etcd,a-robinson/etcd,visheshnp/etcd,xebitstudios/etcd,dterei/etcd,xychu/etcd,qiaochao911/etcd,gosharplite/etcd,Eagle-X/etcd,chai2010-playground/etcd,CrazyJvm/etcd,tamird/etcd,gosharplite/etcd,youxidev/etcd,cchamplin/etcd,olark/etcd,oscarrr110/etcd,snailwalker/etcd,sebschrader/etcd,sofuture/etcd,whuwxl/etcd,joshix/etcd,junxu/etcd,buaazp/etcd,dnaeon/etcd,ravigadde/etcd,msanterre/etcd,endocode/etcd,purpleidea/etcd,xdlinear/etcd,lumjjb/etcd,elimisteve/etcd,hongbinz/etcd,wowsoso/etcd,spotify/etcd,onlyjob/etcd,ravigadde/etcd,yifan-gu/etcd,kingland/etcd,bakins/etcd,fgbreel/etcd,mgoelzer/etcd-fork2,mitake/etcd,robszumski/etcd,dnaeon/etcd,yudai/etcd,beni55/etcd,lzbgt/etcd,sinsharat/etcd,wowsoso/etcd,justintung/etcd,wantonsolutions/dinv-etcd,elimisteve/etcd,chai2010/etcd,jeremyeder/etcd,gyuho/etcd,iamqizhao/etcd,xueshanf/etcd,westhood/etcd,insionng/etcd,hzy001/etcd,onlyjob/etcd,xdlinear/etcd,lorneli/etcd,a-robinson/etcd,junxu/etcd,HideoYamauchi/etcd,yyljlyy/etcd,njucslqq/etcd,gtank/etcd,freeloop1114/etcd,ktateish/etcd,combk8s/etcd,jlamillan/etcd,mischief/etcd,swingbach/etcd,StorReduce/etcd,betawaffle/etcd,shafreeck/etcd,jeremyeder/etcd,endocode/etcd,nieanan/etcd,heyitsanthony/etcd,honeyqa/etcd,xebitstudios/etcd,cockroachdb/etcd,mwitkow/etcd,gtank/etcd,HideoYamauchi/etcd,dalanlan/etcd,Eagle-X/etcd,nekto0n/etcd,OyTao/etcd_learning,whuwxl/etcd,tamird/etcd,jchauncey/etcd,wantonsolutions/dinv-etcd,arthurcolle/etcd,gae123/etcd,jonboulle/etcd,dalanlan/etcd,bspline/etcd,sebrandon1/etcd,njharman/etcd,ecnahc515/etcd,chai2010-playground/etcd,delkyd/etcd,sebrandon1/etcd,etcd-io/etcd,rchicoli/etcd,vimalk78/etcd,rnaveiras/etcd,gityf/etcd,tangkun75/etcd,handsomesun/etcd,cchamplin/etcd,bakins/etcd,gityf/etcd,polvi/etcd,axingblog/etcd,pigfoot/etcd,siddontang/etcd,purpleidea/etcd