Currently we are counting both 
WT_STAT_CONN_EVICTION_APP_TIME and WT_STAT_CONN_APPLICATION_CACHE_TIME in our thread to account for time spent in eviction and waiting for cache. However, after investigating WiredTiger code, we found that eviction_app_time is a subset of application_cache_time, and so we are on some occasions double counting the time spent.

We can remove references to WT_STAT_CONN_EVICTION_APP_TIME.