I'm looking at this repo for load testing looker dashboards with selenium (its very old): https://github.com/looker-open-source/looker-load-testing/blob/6c05299a01b5e432eaf83b1105a5bdc69047b...
It makes heavy use of `window.awaitPerformanceObservation("rendered")`
I can find no information about this method.
When I interactively login to looker is it available in the chrome console and works, but when I call it through selenium it seems to never fire.
What is this `window.awaitPerformanceObservation("rendered")` method? Is it official or is it an implementation detail the repo creator somehow found out about?
What javascript/DOM methods are available to me in my selenium tests to know when a dashboard page has fully loaded? How can I programmatically, through selenium, confirm a dashboard page is finished loading?