Issue Tracking

GitLab (fewer requirements)
Minimum hardware requirements: 4 vCPU and 4 GB RAM support up to 500 users. No specific recommendation for disk size.
GitLab Issues is an issue tracking system, seamlessly integrated with commits and Merge Requests. There is a limited number of fields and statuses, but some of the missing functionality is achieved by using labels, in particular scoped labels (Premium), which can stand in for list-of-values fields and statuses. GitLab also has Epics (Premium), which are similar to Issues, but sharing a theme across several projects and milestones. An Epic can be a parent of one or more child Epics and of one or more Issues
Supporting up to 3000 users, requires 8 vCPUs, 48 GB RAM, 300 GB attached storage, 200 GB root storage.
There is a limited number of fields and statuses, and there is no feature similar to GitLab’s scoped labels. However, there is a beta program, which promises many new features, like custom fields and custom flows.