Datanode mem usage metrics incorrect

[mpfz0r]

The memory usage metrics on my datanode don't match reality.
They seem to ramp up for an hour and then drop back to where they started.
In reality the memory usage stays mostly constant and has never reached more than 18% of the systems memory.

I think the rollup which happens every hour might cause the wrong calculation.

Your Environment

• Graylog Version: 6.0.0-rc2