Ze founder here. We adapted the scraper to our needs, and figured others have probably wanted to do what you're suggesting, so we decided to share it. In fact we pick up the scrape and ingest it into a distributed column store ourselves, where we use it with logs and do anomaly detection with it. I think Prometheus is pretty good at what it does. But like you're saying, depending on what you want to do with the data, sometimes a different backend is useful.