How to find Azure Firewall SNAT exhaustion on a compute unit?

I have some applications on my AKS cluster which frequently hits a application server. This application server URL is behind Akamai. When ever applications want to establish an SSL connection with the external URL, it has to go through Azure Firewall. I have occasional connection timeouts if a connection is not establish to Akamai servers in 1s. 

I saw that the SNAT Utilization is in the range of 10 percent to 30%. I know this graph is smoothened out across instances and can't see which Azure Firewall compute unit is getting overloaded if I have frequent access to one URL which goes through Akamai?

Is there any way to find out the reason for these occasional connection timeouts with the external IPs(Akamai)? through logs or by any other means?

I believe lack of the SNAT metrics by firewall compute unit is responsible for such tough debugging.