Users are not able to see cluster memory graph under YARN. This was working before upgrade.
We were able to reproduce this internally on Ambari 2.6. We checked across 5 clusters and all of them exhibited same behaviour.
Seems like problem with the compute : mem_total._sum - mem_free._sum fails but mem_total._sum + mem_free._sum succeeds.
Also if we load mem_total._sum AND mem_free._sum individually, they come up fine.
Seems like issue when we do a 'subtract'.
Attaching UI Screenshot