It's not clear if sentry provides profiling to me -- I'm not paying any money, so maybe not. But the little magnifying glass labeled "explore" shows a link labeled "profiles", and that shows a list of reasonable-looking stuff. It's just that whenever I click any of the entries in that list, it always just shows a blank page that says "This flamegraph has no data." and "No profiling data found".
Do I need to do something special to make this work?