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Indeed. Prometheus and Grafana are complimentary. In fact PromDash was deprecated in favor of Grafana [1]:

"NOTE: PromDash is deprecated. We recommend Grafana for visualization of Prometheus metrics nowadays, as it has native Prometheus support and is widely adopted and powerful."

This seems like an odd oversight for a "comparison" article.

[1] https://github.com/prometheus-junkyard/promdash

Came here to say this. And it's not like the author doesn't get that, since grafana is recommended in the piece to be used as the visualization layer for the other two. I think they just wanted to get all three names in the post for some reason.

ClickBait

Agreed. Grafana is great as a single-pane-of-glass solution for viewing a variety of stats/logs data, but doesn't actually handle the behind-the-scenes work of collecting/storing them...