The equivalent functionality in PromQL is provided by the various _over_time functions. In addition when converting we need to allow for the different the execution models of PromQL and Graphite. Graphite works on producing a whole graph at once. PromQL executes many queries independently for each vertical time slice, which you could then graph.
Jul 08, 2020 · Prometheus usually exposes histogram metrics with a special metric suffix called _buckets and a special metric label called le (short for less than or equal to).. Histogram metrics are also typically exposed alongside two additional metrics which are suffixed with _count and _total, and correspond to the count of all observations and the sum of all observations.