Azure BLOB 存储虚拟请求

I see strange requests when uploading blobs to storage. The only methods I use is PutBlob and SetBlobTier. But metrics shows large amount of GetBlobProperties requests with time interval about 1 hour. It seems like Azure makes some extra requests for statistic purposes. It happens only when uploading process is running. At attached diagram you can see 4 peaks of GetBlobProperties requests. Does anybody know what is it? Another question is, will I be billed for this requests?

任何 API 调用都被视为一次事务：

交易 – 对存储服务的每个单独的 Blob、表和队列 REST 请求都被视为潜在的计费事务。然后，应用程序可以通过控制向存储服务发送请求的频率和数量来控制其交易成本。我们分析收到的每个请求，然后根据我们处理请求的能力和请求的结果将其分类为可计费或不可计费。