Is there any alert mechanism raising potential risk of unavailability of data on IPFS?

Example: let's say I build a static website and publish it on IPFS (ipfs add so the content is pinned on my machine). My website is getting fairly good attention and I decide after some time to unpin its related data from my machine (and finally turn the latter off). After some amount of time I become anxious and paranoid that my website might "go down" at anytime if less and less people are fetching it.

I started to think about an Observer pattern for users (the data publishers but also anyone else interested) to subscribe to content and get periodic health metadata on it.

Is it something that exists already or crossed someone's mind?