You have been paged because an ESXi host is unreachable. The host had gone down due to a hardware error. Along with it, the host took down a couple of VMs. Thankfully, you have vSphere HA turned on in the cluster and HA restart all the impacted VMs on other hosts in cluster.

Should you want to get a list of impacted VMs, VMware has a KB article.

Find the master node.
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