MongoDB Instance Summary
Ops or Replicated Ops/sec classified by legacy wire protocol type (
getmore). And (from the internal TTL threads) the docs deletes/sec by TTL indexes.
Average latency of operations (classified by read, write, or (other) command)
TCP connections (Incoming)
Open cursors. Includes idle cursors.
Docs per second inserted, updated, deleted or returned. (not 1-to-1 with operation counts.)
Operations queued due to a lock.
Ratio of Documents returned or Index entries scanned / full documents scanned
Scanned and Moved Objects
This panel shows the number of objects (both data (
scanned_objects) and index (
scanned)) as well as the number of documents that were moved to a new location due to the size of the document growing. Moved documents only apply to the MMAPv1 storage engine.
getLastError Write Time
Legacy driver operation: Number of, and Sum of time spent, per second executing
getLastError commands to confirm write concern.
getLastError Write Operations
Legacy driver operation: Number of
getLastError commands that timed out trying to confirm write concern.
This panel shows the number of assert events per second on average over the given time period. In most cases assertions are trivial, but you would want to check your log files if this counter spikes or is consistently high.
Unix or Window memory page faults. Not necessarily from MongoDB.