Propose new error code for unhealthy nodes
Propose new error code for unhealthy nodes

i/tchannel,vanloswang/tchannel,sasa233/tchannel,chenwenbin928/tchannel,vanloswang/tchannel,hustxiaoc/tchannel,bunnyblue/tchannel,savaki/tchannel,chenwenbin928/tchannel,bunnyblue/tchannel,RyanTech/tchannel,RyanTech/tchannel,hustxiaoc/tchannel,benfleis/tchannel,Zirpon/tchannel,hustxiaoc/tchannel,sasa233/tchannel,chenwenbin928/tchannel,savaki/tchannel,bunnyblue/tchannel,RyanTech/tchannel,vanloswang/tchannel,i/tchannel,benfleis/tchannel,Zirpon/tchannel,Zirpon/tchannel,benfleis/tchannel,savaki/tchannel,sasa233/tchannel,i/tchannel