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The `[api]/instance_list_per_project_cells` configuration option
was added, which controls whether or not an instance list for
non-admin users checks all cell databases for results. If
disabled (the default), then a list will always contact each cell
database looking for instances. This is appropriate if you have a
small number of cells, and/or if you spread instances from tenants
evenly across cells. If you confine tenants to a subset of cells,
then enabling this will result in fewer cell database calls, as
nova will only query the cells for which the tenant has instances
mapped. Doing this requires one more (fast) call to the API
database to get the relevant subset of cells, so if that is likely
to always be the same, disabling this feature will provide better
performance.
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