Github user cshannon commented on the issue:
https://github.com/apache/activemq-artemis/pull/1853
@clebertsuconic - The metric in the page counters is persisted along with
the page counters now. When the page counters are written to the journal that
metric is encoded to disk and reloaded on restart.
Older versions of the journal are compatible, they will just not have that
size value loaded as it won't have been saved previously.---
