0% Escalation Rate in Dialogflow CX

[mike_ctint]

I am looking at the Escalation Rate in "Analytics" of Dialogflow CX. Even the conversations are successfully escalated to live agent, the rate is still 0%.

In the docs it seems there is a flag for identifying whether the conversation is successfully escalated. 
https://cloud.google.com/dialogflow/cx/docs/concept/conversation-history
But how and where can I set the flag?

[xavidop]

do you see in the conversation history any conversation that has been escalated?