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" Hints are stored on disk by a hints::manager, ensuring they are eventually sent. A hints::resource_manager ensures the hints::managers it tracks don't consume more than their allocated resources by monitoring disk space and disabling new hints if needed. This series fixes some bugs related to the backlog calculation, but mainly exposes the backlog through a hints::manager so upper layers can apply flow control. Refs #2538 " * 'hh-manager-backlog/v3' of https://github.com/duarten/scylla: db/hints/manager: Expose current backlog db/hints/manager: Move decision about blocking hints to the manager db/hints/resource_manager: Correctly account resources in space_watchdog db/hints/resource_manager: Replace timer with seastar::thread db/hints/resource_manager: Ensure managers are correctly registered db/hints/resource_manager: Fix formatting db/hints: Disallow moving or copying the managers