I believe so, but have recently stumbled upon Netdata which scratches the "I don't want to maintain an entire monitoring stack for these few boxes" kind of itch. Need to work with it some more to nail down the trade-offs.

Prometheus isn't quite enough on its own. You need Prometheus, Grafana, Tempo, Loki, Faro, and Pyroscope to get close to Datadog's feature set.