Is it known of any issues for os ticket 1.15 when upgrading to redhat 8.0
Wai-kwong
1.15.x is no longer supported, you really need to upgrade to one of the latest releases of v1.16.4 or v1.17.2. Also, if Redhat 8.0 meets 1.15.x requirements/pre-requisites then it should be fine.
Cheers.