The cache_eviction_maximum_page_size statistic is supposed to be cleared (reset to zero) on each checkpoint, so that the statistic reports the largest page evicted during each checkpoint period.

At some point, the code clearing this to zero was removed, so the statistic now effectively shows the largest page ever evicted in the life of the system.

We should restore the original behavior, probably by setting conn->evict->evict_page_max_size to zero when we clear other per-checkpoint-stats at the beginning of __checkpoint_db_internal().