Haven't looked more into this, but there is project about doing bug / issue tracking in pure git itself - https://github.com/MichaelMure/git-bug.
Also, meta issue about decentralized / federated GitHub alternative - https://github.com/JoinMarket-Org/joinmarket-clientserver/issues/1302.
I remember coming across git-bug when I was building https://gitern.com ... It's how I was planning to do issues.
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