Depends on the use case. If you only need to do some basic stuff like give me room temperature for that room between t1 and t2, or average server usage for all servers, fine. But any more business or analytical queries like "timeline of when was this true or false", "histogram of temperatures", "Power consumption this month", "runtime in hours per shift (where each shift is an arbitrary division in time)" are left in the cold with seemingly little progress made to fit these use cases. So for a system that claims real-time visibility it has suprisingly little analytical and time-based capabilities.
