[cik]

A yank test on process and infrastructure is more than a 'did it come up'. It's a "if we totally nuke the thing" - say, were we to rip the hard drives out of a server, fry it, and recreate it - does it come up identicall(is).

That way we know our CMDB is accurate, our workflows are accurate, credentials, ansible, terraform, images, etc. Right down to tickets.

It's how we manage all of our cloud customers.