make metric registry global variable
make metric registry global variable

mrkeng/alerta,0312birdzhang/alerta,guardian/alerta,skob/alerta,0312birdzhang/alerta,skob/alerta,mrkeng/alerta,mrkeng/alerta,skob/alerta,guardian/alerta,skob/alerta,guardian/alerta,guardian/alerta,mrkeng/alerta,0312birdzhang/alerta