Hi Zhen, there is a lot of counters in wiredTiger.cache but i choose some could be intersting:
bytes currently in the cache => 12 GB
bytes dirty in the cache cumulative => 320 GB although that number is cumulative since the last restart
bytes allocated for updates => 400 MB
eviction worker thread evicting pages => 12717598
I didn’t see any other counter with relative larger numbers.
Hello @kevinadi and @steevej could you help us ? 
Thank you @Zhen_Qu