Here's how it works:
1. Connect to remote MongoDB database
2.Define metrics once, simply as creating a {query} or an [aggregation] on your data
3.Analyze changes in your site's performance over various lengths of time and compare to past performance
There is a Free account to track up to 3 metrics and unlimited to track unlimited metrics for $29/month, but payments aren't connected so it's free for unlimited metrics now.
I'm aware there is MongoDB Charts, but I personally wanted something easier to use just for analytics and not only for databases hosted on Mongo Atlas.
I'm transparent about what it stores (https://databaselog.com/doc/we-do-not-store-your-data) and recommend using it with read-only user to be 100% safe nothing changes.
If you're interested in how I built Databaselog, I shared my progress publicly (https://twitter.com/MattHlavacka/status/1264172956130869248)
Please let me know if you're interested or have any feedback.