ceilometer/releasenotes/notes/refresh-legacy-cache-e4dbbd...

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---
fixes:
- |
A local cache is used when polling instance metrics to minimise calls Nova
API. A new option is added `resource_cache_expiry` to configure a time to
live for cache before it expires. This resolves issue where migrated
instances are not removed from cache. This is only relevant when
`instance_discovery_method` is set to `naive`. It is recommended to use
`libvirt_metadata` if possible.