How to enable libvirt event logging?

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http://serverfault.com – I have one controller node with CentOS and one compute node with kvm hyperviser. I am using OpenStack. When I run the nova boot command, it will create one virtual machine one compute host. We can change the /var/libvirt/libvirtd.conf on the compute host to enable the libvirtd logging. I set values like log_level = 2 log_filters="2:libvirt 2:util 2:qemu 1:event" audit_logging = 1 This will enable logging but not logging the libvirt events. Is there any other value I have to set in .conf file? (HowTos)