what is the meaning of Ceilometer event traits name?

asked 2017-04-20 02:51:39 -0600

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

traits: &instance_traits

...

traits:

<<: *instance_traits

...

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

please help

Thank in advance.

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