Virtual GTM Health Monitors through Cisco ASA to public IP address

Hi not the case, the GTM/LTM is behind the ASA but the IP that the GTM is trying to monitor is an Outside Public IP address of the ASA. This Public IP address of the ASA is the NAT'd address that a client would use from the internet to access the web service through the LTM.

Because by design you can't ping ab Cisco ASA outside interface address from the Inside interface address, how can I configure the GTM to Monitor the GTM Virtual server on the public address?