yswdqz commented on issue #9376:
URL: https://github.com/apache/skywalking/issues/9376#issuecomment-1200198951
Thank you, I understand where I am wrong.
And I change the exp to `100 -
mysql_buffer_pool_pages.tagEqual('kind','free').sum([]) * 100 /
mysql_buffer_pool_pages.sum([])`
It works successfully now.
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