Side story, and that might not be true as of today, but Datadog was a nightmare billing-wise for me. Probably precisely because they didn't use a tool like the one launched in this post. Anything ranging from seeing your live usage to getting a rough idea of what your bill at the end of the month would be was impossible, not to mention the absence of any kind of alert even after reaching $30x our previous month usage. Usage based is fantastic when done properly, but can quickly turn to a nightmare for the user on half-assed systems.