scaling an application does not show current constraints

[mitechie]

I've deployed https://jujucharms.com/spark-processing/

It defines spark as

services:
  spark:
    charm: "cs:xenial/spark-56"
    constraints: "mem=7G root-disk=32G"
    num_units: 2
    ....

However when I go to scale it and select one unit per machine (which seems like it should be the default vs the manual place?) I get asked to insert constraints but none of the current values are filled in:

[clagom]

@hatched Is this still relevant?

[hatched]

It is