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skywalking-java/docs/en/FAQ/Hour-Day-Metrics-Stopping.md

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Why metrics indexes in Hour and Day precisions stop update after upgrade to 7.x?

This is an expected case when 6.x->7.x upgrade. Read Downsampling Data Packing feature of the ElasticSearch storage.

The users could simply delete all expired *-day_xxxxx and *-hour_xxxxx(xxxxx is a timestamp) indexes. SkyWalking is using metrics name-xxxxx and metrics name-month_xxxxx indexes only.