Necro-posting this one because it still ranks well for anyone searching this exact question, and the underlying situation hasn't changed structurally: Jira Cloud (via Forge) still doesn't expose a native change-history event for permission scheme edits — Nic's answer above is still accurate.
For anyone landing here now: since there's no native version history, the workaround is usually either (a) periodic manual exports/screenshots to diff against later, which doesn't scale well, or (b) a scheduled snapshot + diff approach — capture the scheme's state on a schedule and compare against the previous capture to reconstruct what changed and roughly when.
Disclosure: I'm the developer behind a Marketplace app (Sphior Ledger for Jira) built around exactly this pattern, so take the mention with that context — but the snapshot+diff approach above works fine as a DIY pattern too if you'd rather build it yourself.
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