bugfix: load yaml config for transformers
bugfix: load yaml config for transformers

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