NetScaler HA heartbeats in Azure
When using NetScaler with multiple NICs in Azure, heartbeats will not be seen on other interfaces other than the one NSIP is configured on.
To resolve this, disable heartbeats on the other interfaces (in my case, NSIP is on 0/1 and disabling on 1/1 and 1/2):
set interface 1/1 -haheartbeat OFF
set interface 1/2 -haheartbeat OFF