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](../setup/backend/backend-storage.md#downsampling-data-packing)
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.