We created our own field for Rough Estimates and are using this field as estimate. After updating to JIRA 8 there are no longer entries in the History when users change the estimate. So we cannot find out, who did changes to Estimates.....
I saw that you created a ticket with our support related to the same question, so to avoid any possible misunderstandings or miscommunication that may arise from discussing the same matter in two different platforms, let's focus on the ticket instead.
Once the ticket is closed, feel free to share the resolution here to help other community members that may face the same issue.
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