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## Problem `tenant_get_shards()` does not work with a sharded tenant on 1 pageserver, as it assumes an unsharded tenant in this case. This special case appears to have been added to handle e.g. `test_emergency_mode`, where the storage controller is stopped. This breaks e.g. the sharded ingest benchmark in #9591 when run with a single shard. ## Summary of changes Correctly look up shards even with a single pageserver, but add a special case that assumes an unsharded tenant if the storage controller is stopped and the caller provides an explicit pageserver, in order to accomodate `test_emergency_mode`.