I started github issue trackers for German open transit datasets to share issues with the responsibles and other data users. Some data users and a few publishers registered as watchers and I think it is better than not having it. Others reject such public trackers as they could be interpreted as public shaming and prevent orgs from publishing their data openly in the first place.
However, without buy-in from data publishers, this is just makes visible the demand. Two thirds of all created issues are still open.
I‘d love to see an issue tracker for published datasets. JSON-LD metadata should link it, e.g. as discussionUrl. But seems like to few see a benefit for this.
Regarding available issue trackers, I looked into Redmine this WE. There exist a bunch of plugins (eg Slack integration, Geo support) for it and it looks very configurable