This post had its title changed from "telemetry.optIn defaults to true" (which is the headline) to "Telemetry settings in Kibana" which is somewhat useless as a headline. What's the big deal?
"telemetry.optIn defaults to true" indicates that some setting, somewhere out in the world, defaults telemetry to true. It's a clickbait title.
Poster should have titled it "Kibana Telemetry Is Opt-out" if they wanted it to be a proper title.
Imagine buying wipes labelled wipes, but they were actually dry tissues.
It’s not about Kibana, or telemetry, or telemetry being opt-out. It’s about exactly what I copied from the page for lack of a deep link: the opt-out setting is deceitfully named opt-in.