I just checked their website and they have 4 products listed under "Products"... Grafana is obviously the main one, their original product and the most popular

I just checked their website and they have 4 products listed under "Products"... Grafana is obviously the main one, their original product and the most popular one. It's to aggregate data from various sources and make dashboards. Loki is a logs collector that I personally didn't try but I think it's popular. They released it after Grafana. I don't know the third one. The last one seems to be a wrapper around Prometheus (a metrics collector/database). Fair to assume you should start with Grafana. For the source, if you don't have a Prometheus instance, you can test it with any SQL database.