Update release notes for v1.1.11
Update release notes for v1.1.11

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