Is there a successful task ping rate limit?
Yes: we accept up to 5 pings per minute, per check. That's more than enough in practice, because our scheduled-task monitor only acts on "the last ping within the past minute" anyway.
If you send us more than 5 pings in a given minute, we ignore the extras. The check still shows as successful, you just won't see all of the additional pings in the history.
If you're running something more frequent than once per minute, cron-style monitoring probably isn't the right fit. Consider using a healthcheck endpoint instead, which is purpose-built for high-frequency reporting.