Don't panic! We frequently purge scheduled task logs and remove consecutive successful pings to keep your history clean.
This means we keep all failures and missed pings along with any successful pings either side of these events. Remember you will be notified of any missing pings - just make sure you have cron monitoring enabled and you can send a test ping :)
Tip: check your server timezone in the cron definition is correct otherwise you will get missing ping alerts even if your job finishes 'on time'!
How to view your scheduled task history
Your event log can be found at the bottom of your scheduled task detail page below your 30 day health chart. You will also see any custom payloads that were sent with your pings.