refer : https://techcommunity.microsoft.com/t5/azure-database-for-mysql-blog/setting-up-proxysql-as-a-connection-pool-for-azure-database-for/ba-p/2589350

  On app server In extra VM In K8S cluster
Public access (allowed IP addresses) Not recommended
Private access (VNet
integration)
Round-trip time (RTT)* 2*t3 2*(t1+t2) Internal communication
within k8s+2*t4

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