Table 1 lists the DB instance monitoring metrics.

**Table 1** DB instance monitoring metrics
Metrics	Unit
COMMAND Statements per Second	Count/s
DELETE Statements per Second	Count/s
INSERT Statements per Second	Count/s
QUERY Statements per Second	Count/s
UPDATE Statements per Second	Count/s
GETMORE Statements per Second	Count/s
Chunks of Shard 1	Count
Chunks of Shard 2	Count
Chunks of Shard 3	Count
Chunks of Shard 4	Count
Chunks of Shard 5	Count
Chunks of Shard 6	Count
Chunks of Shard 7	Count
Chunks of Shard 8	Count
Chunks of Shard 9	Count
Chunks of Shard 10	Count
Chunks of Shard 11	Count
Chunks of Shard 12	Count
Active Instance Connections	Count
Chunk Migration Failures in Last 24 hrs	Count

The monitoring metrics of the primary nodes in the config's and shard's replica sets are as follows:

Table 3 lists database metrics.

**Table 3** Database metrics
Metrics	Unit
COMMAND Statements per Second	Count/s
DELETE Statements per Second	Count/s
INSERT Statements per Second	Count/s
QUERY Statements per Second	Count/s
UPDATE Statements per Second	Count/s
GETMORE Statements per Second	Count/s
Active Connections	Count
Resident Memory	MB
Virtual Memory	MB
Regular Asserts per Second	Count/s
Warning Asserts per Second	Count/s
Message Asserts per Second	Count/s
User Asserts per Second	Count/s
Number of Operations Queued Waiting for the Lock	Count
Operations Queued Waiting for a Read Lock	Count
Operations Queued Waiting for a Write Lock	Count
Page Faults	Count
Slow Queries	Count
Maintained Cursors	Count
Timeout Cursors	Count
Bytes in WiredTiger Cache	MB
Tracked Dirty Bytes in WiredTiger Cache	MB
Bytes Written Into Cache per Second	bytes/s
Bytes Written From Cache per Second	bytes/s
Oplog Window	h
Oplog Growth Rate	MB/h

The monitoring metrics of the secondary or hidden nodes in the config's and shard's replica sets are as follows:

The ECS monitoring metrics are the same as those of the primary nodes in the config's and shard's replica sets. For details, see Table 2.

Table 4 lists database metrics.

**Table 4** Database metrics
Metrics	Unit
COMMAND Statements per Second	Count/s
DELETE Statements per Second	Count/s
INSERT Statements per Second	Count/s
QUERY Statements per Second	Count/s
UPDATE Statements per Second	Count/s
GETMORE Statements per Second	Count/s
Active Node Connections	Count
Resident Memory	MB
Virtual Memory	MB
Regular Asserts per Second	Count/s
Warning Asserts per Second	Count/s
Message Asserts per Second	Count/s
User Asserts per Second	Count/s
Operations Queued Waiting for a Lock	Count
Operations Queued Waiting for a Read Lock	Count
Operations Queued Waiting for a Write Lock	Count
Page Faults	Count
Slow Queries	Count
Maintained Cursors	Count
Timeout Cursors	Count
Bytes in WiredTiger Cache	MB
Tracked Dirty Bytes in WiredTiger Cache	MB
Bytes Written Into Cache per Second	bytes/s
Bytes Written From Cache per Second	bytes/s
Replication Headroom	s
Replication Lag	s
Replicated COMMAND Statements per Second	Count/s
Replicated UPDATE Statements per Second	Count/s
Replicated DELETE Statements per Second	Count/s
Replicated INSERT Statements per Second	Count/s

mongos metrics are as follows:

Table 6 lists database metrics.

**Table 6** Database metrics
Metrics	Unit
COMMAND Statements per Second	Count/s
DELETE Statements per Second	Count/s
INSERT Statements per Second	Count/s
QUERY Statements per Second	Count/s
UPDATE Statements per Second	Count/s
GETMORE Statements per Second	Count/s
Active Node Connections	Count
Resident Memory	MB
Virtual Memory	MB
Regular Asserts per Second	Count/s
Warning Asserts per Second	Count/s
Message Asserts per Second	Count/s
User Asserts per Second	Count/s

Monitoring metrics of the primary node
- Table 2 lists the ECS monitoring metrics.
- Table 3 lists database metrics.
Monitoring metrics of the secondary or hidden node
- Table 2 lists the ECS monitoring metrics.
- Table 4 lists database metrics.

DDS Metrics