Crawler already has bunch of internal private state flags. This method could inspect those state flags and maybe also _autoscaled_pool state and report back some sort of public state assessment?
I don't mind the idea, but that looks very much like standalone PR. Then I could modify this test with newly added "state" method.

Just quick guess of possible states:
"Starting"
"Processing requests"
"Waiting in keep alive"
"Shutting down due to unexpected stop"
"Aborted"
"Finished"
"Stopped"
....