what is the meaning of Ceilometer event traits name?

asked 2017-04-20 02:51:39 -0500

zero gravatar image

Hello, I am looking at the Ceilometer event definition file event_definitions.yaml. I found these:

traits: &instance_traits



<<: *instance_traits


what does & and << mean here? is there any reference about this ?

please help

Thank in advance.

edit retag flag offensive close merge delete