Build process has been fixed and since 1.6.2 there is no such issue.
Greg Thomas July 9, 2018 at 8:58 AM
The parent plugin for Monitoring is Openfire 4.3.0-SNAPSHOT. I suspect that dropping it to 4.2.0 should do the trick if you want to make it compatible with Openfire 4.2.
wroot July 7, 2018 at 8:07 AM
Plugin is reverted to 1.6.0 on the downloads page until the issue is fixed.
Monitoring plugin since 1.6.1 version has a problem with accessing Statistics and Archiving pages. Shows either a blank page or 404 error. Logs show: