Grouping vSphere objects for custom alerting

Hello,

in VMAN it's quite easy. In each alert just define Cluster Name, i.e.:
Alert1 - find out all VMs with CPU load higher than 90% running under "Cluster Dev" cluster:

Search query: vm.cpuload.latest:[90 TO *] AND vm.cluster.name:"Cluster Dev"

Alert2 - find out all Hosts under "Cluster Prod" cluster with high write latency (last hour average):

Search query: host.writeLatency.hour:[10 TO *] host.cluster.name:"Cluster Prod"

More info about Search and Alerts.

Or do you mean alert definition in Orion?

Thanks, but I think I'm looking more to do something like this...

"For all Production systems, alert 24x7"

"For all Dev systems, DO NOT alert between midnight-6am"

So how can I group systems together in vman and orion? 

In VMAN it's not so easy to skip alerting after business hours / workdays. But it's possible.You can get inspired by this Thwack post. So you can combine the 2nd xPath with something like 'if(/virtualMachine/cluster/name="Dev Cluster") then ...'.

In Orion the alerting is much more complex with moany options, including scheduling alerts in defined time slot (Time of Day tab).