Integrated alerting

Hi , i am just using integrated alerting in pmm server and configured slack to receive alerts . i received alerts in the slack based on the rules and also i have used alertmanager integration . if i hit the alert link which i received in slack is getting redirected to the localhost:9093 but i want it to be redirected to my own alertmanager ip eg: alertmanager:9093 . how to accomplish the same, kindly help me out