I used to be quite fond of Datadog but after one or two completely surprising bills (thanks to their granular but unintuitive pricing model), I wouldn't recommend it to anybody any more. If I were more cynical I would say the pricing model is designed to be confusing so customers spend more than they need, and this is only made worse by the extreme breadth of the platform now.

These days I'd suggest to just suck it up, spin up a Grafana box, and wire up OpenTelemetry.