nova/releasenotes/notes/instance-list-batching-45f90a8b13eef512.yaml

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---
features:
- |
Instance list operations across cells are now made more efficient by batching queries
as a fraction of the total limit for a request. Before this, an instance list with a
limit of 1000 records (the default) would generate queries to each cell with that
limit, and potentially process/sort/merge $num_cells*$limit records, despite only
returning $limit to the user. The strategy can now be controlled via
``[api]/instance_list_cells_batch_strategy`` and related options to either use
fixed batch sizes, or a fractional value that scales with the number of configured
cells.