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If your repository is part of an organization, you could, starting May 23rd 2019 (4 years later), use the Audit Log API
Today we’re introducing the public beta of the Audit Log API.
As a GitHub Enterprise Cloud organization administrator, you can now access log events using our GraphQL API and monitor the activity in your organization.
As explained in “Using the Audit log API“, this is only, for now, reserved to organizations using GitHub Enterprise.
See “GraphQL API Audit Log preview“, for the exact API.
👤VonC
Source:stackexchange.com