grafana / grafana/pyroscope

Cache meta iteration in store-gateway

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Description

Right now each store-gateway download the last 31d metadata blocks on initial startup, on ring change (new member), and periodically (default 15m).

This can causes high CPU usage by store-gateways since there's can be many blocks (thousand).

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I think we can improve this, by only updating the latest block prefixes and caching meta files on disk/memory.

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