} }, 

The server-status-wiredTiger statistics section reports details about the WiredTiger statistics: 

New in version 3.0: server-status-wiredTiger statistics section. This section appears only for the WiredTiger storage engine. 

"wiredTiger" : { "uri" : "statistics:", "LSM" : { "sleep for LSM checkpoint throttle" : <num>, "sleep for LSM merge throttle" : <num>, "rows merged in an LSM tree" : <num>, "application work units currently queued" : <num>, "merge work units currently queued" : <num>, "tree queue hit maximum" : <num>, "switch work units currently queued" : <num>, "tree maintenance operations scheduled" : <num>, "tree maintenance operations discarded" : <num>, "tree maintenance operations executed" : <num> }, "async" : { "number of allocation state races" : <num>, "number of operation slots viewed for allocation" : <num>, "current work queue length" : <num>, "number of flush calls" : <num>, "number of times operation allocation failed" : <num>, "maximum work queue length" : <num>, "number of times worker found no work" : <num>, "total allocations" : <num>, "total compact calls" : <num>, "total insert calls" : <num>, "total remove calls" : <num>, "total search calls" : <num>, "total update calls" : <num> }, "block-manager" : { "mapped bytes read" : <num>, "bytes read" : <num>, "bytes written" : <num>, "mapped blocks read" : <num>, "blocks pre-loaded" : <num>, "blocks read" : <num>, "blocks written" : <num> }, "cache" : { "tracked dirty bytes in the cache" : <num>, "bytes currently in the cache" : <num>, "maximum bytes configured" : <num>, "bytes read into cache" : <num>, "bytes written from cache" : <num>, "pages evicted by application threads" : <num>, "checkpoint blocked page eviction" : <num>, "unmodified pages evicted" : <num>, "page split during eviction deepened the tree" : <num>, "modified pages evicted" : <num>, "pages selected for eviction unable to be evicted" : <num>, "pages evicted because they exceeded the in-memory maximum" : <num>, 

