Thanks for your repponse, Actually I need to get the active tenants using the ceilometer meter. Is there any possibility?

Nope, the only option is to create your own meter.

Here is list of current meters - http://docs.openstack.org/admin-guide...

Can you be able to show me the example of how we can create the meter , Any links for demo?

Basically smth like this:

*ceilometer sample-create --resource-id custom-tenants --meter-name active.tenants --meter-type gauge --meter-unit Tenants --sample-volume <$SomeValue> *

Of course U have to wrap it in some script and run via cron.

For more details: ceilometer help sample-create