In regards to Keen's SLAs, our general uptime can be viewed here: status.keen.io.
Additionally there is information on general API limits here: https://keen.io/docs/api/#limits.
If you're wondering what our data-retention policy, please see our Terms of Service. The document can be quite a mouthful! In summary, we will not be deleting your data.
You can find out more about our SLAs here.