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* master: add conditional grow by average fill ratio to VolumeGrow gRPC Callers that pre-grow volumes on fill level currently have to list all volumes of a collection and sum sizes themselves, which is expensive on clusters with millions of volumes. The master already tracks each writable volume's effective size in memory, so it can answer the question directly. Add grow_avg_fill_threshold to VolumeGrowRequest: when set (e.g. 0.6), growth only happens once the layout's writable volumes have reached that average fill ratio. A layout with no writable volumes skips the check, since that is the case growth exists to fix. VolumeGrowResponse now reports the observed avg_fill and writable_count whether or not growth was triggered. * master: unit tests for WritableAvgFill and FindVolumeLayout Covers the average-fill computation (mixed fills, no writables, a writable volume without a size-tracking entry yet) and that FindVolumeLayout resolves existing layouts without creating missing collections. * address review: report avg_fill and writable_count for every VolumeGrow The stats were only read when grow_avg_fill_threshold was set, so a request without a threshold got AvgFill=0 and WritableCount=0 even when writable volumes existed. Read the layout stats unconditionally and use the threshold only to decide whether growth happens. * master: scope the grow fill check to the requested target A VolumeGrow aimed at a data center, rack or node must not skip growth because fill elsewhere keeps the layout average below the threshold. Measure only writables serving the target; a target with none still grows. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>