rate(http_requests_total[5m] @ 1609746000)
#This returns the 5-minute rate that http_requests_total had at 2021-01-04T07:40:00+00:00
你好，谁能帮我解释一下上面这句话是什么意思？我是普罗米修斯的新手，我对速率函数中的确切时间有点困惑。
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