The CentOS project is using different trackers, based on which team needs to be in charge of the issue to solve. While we (CentOS Infra) are ourselves using the pagure.io one (hosted and maintained by Fedora), there is only one that we are hosting : bugs.centos.org.
Hosted in CentOS infra. That's the first and legacy tracker that was deployed initially in the CentOS Project, to track all issues, software or infra related.
The software stack is using :
The ansible-role-mantisbt is used to deploy dependencies and include all needed roles but itself was never really configured to deploy the application itself (can be easily fixed though) but backup is taking care of application (php files) backup and so can be moved easily if needed (applying the role, restoring backup at proper location)
Note
Worth knowing that because starting from Stream, all bugs will be reported to Bugzilla (see below) and that all infra tickets are also migrated to pagure.io, bugs.centos.org is called "legacy" and will probably be decommissioned soon
Hosted by Fedora and used for infra tracker. Url is https://pagure.io/centos-infra/issues
Hosted by Red Hat and used for everything related to CentOS Stream