The usage of tObserver is free and you can use it to monitor as many instances as you want. Please refer to the Terms & Conditions for more details.
I'm aware, that tObserver for some features is similar to TYPO3 Caretaker or TYPO3 monitor. Anyway, I love coding and creating own solutions, so I decided to create my own TYPO3 monitoring tool.
The tObserver TYPO3 extension is open source and can be viewed public on GitHub. The following data will be transmitted by the tObserver TYPO3 extension to the tObserver server:
Only the user (and of course me) who created the TYPO3 instance on tObserver is able to access the instance data.