nova/releasenotes/notes/sync_power_state_pool_size-81d2d142bffa055b.yaml

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---
other:
- New configuration option sync_power_state_pool_size
has been added to set the number of greenthreads available
for use to sync power states. Default value (1000) matches
the previous implicit default value provided by Greenpool.
This option can be used to reduce the number of concurrent requests
made to the hypervisor or system with real instance power states
for performance reasons.