bnx2x is a network driver on the ESXi host. Please check if the bnx2x is installed by running the command esxcli software vib list | grep -i bnx2x
If installed, check which driver version/firmware is installed and is it in use ..
Monitoring the ESXi host is provided by hardware partner or there are other third party monitoring tools available however if the ESXi host is going to PSOD then need to fix that PSOD first. Monitoring tool will only gives you the notification when the ESXi host does PSOD however it does not do any rectify the problem
Thanks,
MS