What is the meaning of innodb_cache_usage_rate

Document ID : KB000073534
Last Modified Date : 15/03/2018
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What is the checkpoint innodb_cache_usage_rate exactly measuring with mysql probe?
The probe uses 'SHOW GLOBAL STATUS' to query MySQL properties and calculates innodb_cache_usage_rate as follows:

Innodb_buffer_pool_pages_free / Innodb_buffer_pool_pages_total
Additional Information:
More information regarding the counters used can be found at the following address: