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我有一个json文件在一小时内存储了github归档事件。我必须计算以下指标：
每天（向任何分支）提交（推送）的平均数量
问题保持打开状态的平均时间
拉取请求合并的平均时间
每个开发人员的提交比率
这是我的json文件中的一个对象： {"id":"13365648683","type":"PushEvent","actor":{"id":66756913,"login":"GDawg78","display_login":"GDawg78","gravatar_id":"","url":"https://api.github.com/users/GDawg78","avatar_url":"https://avatars.githubusercontent.com/u/66756913?"},"repo":{"id":290360761,"name":"GDawg78/portfolio-site","url":"https://api.github.com/repos/GDawg78/portfolio-site"},"payload":{"push_id":5613906078,"size":1,"distinct_size":1,"ref":"refs/heads/master","head":"7c116132d3e9f7d814fcb1937b586e06187f9174","before":"c24872c2919c0cea4fe3c23ba7eac86a5b0ff243","commits":[{"sha":"7c116132d3e9f7d814fcb1937b586e06187f9174","author":{"name":"Gavin","email":"33fd0301077bc24fc6513513c71e288fcecc0c66@gavinsimms.com"},"message":"starting most of css again","distinct":true,"url":"https://api.github.com/repos/GDawg78/portfolio-site/commits/7c116132d3e9f7d814fcb1937b586e06187f9174"}]},"public":true,"created_at":"2020-09-01T00:12:35Z"} 我不是想让任何人为我写代码。我只是寻找一些关于github事件属性的文档来理解json文件。