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Measurement Types

The measurements endpoint returns the available measurement types for use with the Ops Manager Measurements API resource.

Host Measurements

ASSERT_REGULAR ASSERT_WARNING ASSERT_MSG ASSERT_USER	Rate of asserts for a MongoDB process found in the asserts document that the serverStatus command generates.
BACKGROUND_FLUSH_AVG	Amount of data flushed in the background.
CACHE_BYTES_READ_INTO CACHE_BYTES_WRITTEN_FROM CACHE_DIRTY_BYTES CACHE_USED_BYTES TICKETS_AVAILABLE_READS TICKETS_AVAILABLE_WRITE	Amount of bytes in the WiredTiger storage engine cache and tickets found in the wiredTiger.cache and wiredTiger.concurrentTransactions documents that the serverStatus command generates.
CONNECTIONS	Number of connections to a MongoDB process found in the connections document that the serverStatus command generates.
CURSORS_TOTAL_OPEN CURSORS_TOTAL_TIMED_OUT	Number of cursors for a MongoDB process found in the metrics.cursor document that the serverStatus command generates.
EXTRA_INFO_PAGE_FAULTS GLOBAL_ACCESSES_NOT_IN_MEMORY GLOBAL_PAGE_FAULT_EXCEPTIONS_THROWN	Numbers of Memory Issues and Page Faults for a MongoDB process.
GLOBAL_LOCK_CURRENT_QUEUE_TOTAL GLOBAL_LOCK_CURRENT_QUEUE_READERS GLOBAL_LOCK_CURRENT_QUEUE_WRITERS	Number of operations waiting on locks for the MongoDB process that the serverStatus command generates. Ops Manager computes these values based on the type of storage engine.
INDEX_COUNTERS_BTREE_ACCESSES INDEX_COUNTERS_BTREE_HITS INDEX_COUNTERS_BTREE_MISSES INDEX_COUNTERS_BTREE_MISS_RATIO	Number of index btree operations.
JOURNALING_COMMITS_IN_WRITE_LOCK JOURNALING_MB JOURNALING_WRITE_DATA_FILES_MB	Number of journaling operations.
MEMORY_RESIDENT MEMORY_VIRTUAL MEMORY_MAPPED COMPUTED_MEMORY	Amount of memory for a MongoDB process found in the mem document that the serverStatus command collects.
NETWORK_BYTES_IN NETWORK_BYTES_OUT NETWORK_NUM_REQUESTS	Amount of throughput for MongoDB process found in the network document that the serverStatus command collects.
OPLOG_REPLICATION_LAG_TIME OPLOG_RATE_GB_PER_HOUR OPLOG_MASTER_TIME OPLOG_MASTER_LAG_TIME_DIFF	Durations and throughput of the MongoDB process’ oplog. The OPLOG_SLAVE_LAG_MASTER_TIME metric is deprecated in the measurement API. Use the OPLOG_REPLICATION_LAG_TIME metric instead. It returns decimal values (seconds and milliseconds). For example, the value 2.75 means 2 seconds and 750 milliseconds.
DB_STORAGE_TOTAL DB_DATA_SIZE_TOTAL	On-disk storage space as collected from the MongoDB dbStats command.
OPCOUNTER_CMD OPCOUNTER_QUERY OPCOUNTER_UPDATE OPCOUNTER_DELETE OPCOUNTER_GETMORE OPCOUNTER_INSERT	Rate of database operations on a MongoDB process since the process last started found in the opcounters document that the serverStatus command collects.
OPCOUNTER_REPL_CMD OPCOUNTER_REPL_UPDATE OPCOUNTER_REPL_DELETE OPCOUNTER_REPL_INSERT	Rate of database operations on MongoDB secondaries found in the opcountersRepl document that the serverStatus command collects.
DOCUMENT_METRICS_RETURNED DOCUMENT_METRICS_INSERTED DOCUMENT_METRICS_UPDATED DOCUMENT_METRICS_DELETED	Average rate of documents returned, inserted, updated, or deleted per second during a selected time period.
OPERATIONS_SCAN_AND_ORDER	Average rate for operations per second during a selected time period that perform a sort but cannot perform the sort using an index.
OP_EXECUTION_TIME_READS OP_EXECUTION_TIME_WRITES OP_EXECUTION_TIME_COMMANDS	Average execution time in milliseconds per read, write, or command operation during a selected time period. Available to hosts running MongoDB 3.4 or later.
RESTARTS_IN_LAST_HOUR	Number of times the host restarted within the previous hour.
SYSTEM_MEMORY_USED SYSTEM_MEMORY_FREE SYSTEM_MEMORY_AVAILABLE	Physical memory usage, in bytes.
SYSTEM_NETWORK_BYTES_IN SYSTEM_NETWORK_BYTES_OUT	Network throughput in bytes per second.
SWAP_USAGE_USED SWAP_USAGE_FREE	Total amount swap space in use.

QUERY_EXECUTOR_SCANNED	Average rate per second to scan index items during queries and query-plan evaluations found in the value of totalKeysExamined from the explain command.
QUERY_EXECUTOR_SCANNED_OBJECTS	Average rate of documents scanned per second during queries and query-plan evaluations found in the value of totalDocsExamined from the explain command.
QUERY_TARGETING_SCANNED_PER_RETURNED	Ratio of the number of index items scanned to the number of documents returned.
QUERY_TARGETING_SCANNED_OBJECTS_PER_RETURNED	Ratio of the number of documents scanned to the number of documents returned.

Process Measurements

PROCESS_CPU_USER PROCESS_CPU_KERNEL PROCESS_CPU_CHILDREN_USER PROCESS_CPU_CHILDREN_KERNEL	MongoDB CPU usage. For hosts with more than one CPU core, these values can exceed 100%. Requires Ops Manager Automation.
PROCESS_NORMALIZED_CPU_USER PROCESS_NORMALIZED_CPU_KERNEL PROCESS_NORMALIZED_CPU_CHILDREN_USER PROCESS_NORMALIZED_CPU_CHILDREN_KERNEL	MongoDB CPU usage scaled to a range of 0% to 100% by dividing by the number of CPU cores. Requires Ops Manager Automation.

System Measurements

SYSTEM_CPU_USER SYSTEM_CPU_KERNEL SYSTEM_CPU_NICE SYSTEM_CPU_IOWAIT SYSTEM_CPU_IRQ SYSTEM_CPU_SOFTIRQ SYSTEM_CPU_GUEST SYSTEM_CPU_STEAL	CPU usage of processes on the host. For hosts with more than one CPU core, this value can exceed 100%. Requires Ops Manager Automation.
SYSTEM_NORMALIZED_CPU_USER SYSTEM_NORMALIZED_CPU_KERNEL SYSTEM_NORMALIZED_CPU_NICE SYSTEM_NORMALIZED_CPU_IOWAIT SYSTEM_NORMALIZED_CPU_IRQ SYSTEM_NORMALIZED_CPU_SOFTIRQ SYSTEM_NORMALIZED_CPU_GUEST SYSTEM_NORMALIZED_CPU_STEAL	CPU usage of processes on the host scaled to a range of 0 to 100% by dividing by the number of CPU cores. Requires Ops Manager Automation.
SYSTEM_MEMORY_USED SYSTEM_MEMORY_FREE SYSTEM_MEMORY_AVAILABLE	Physical memory usage, in bytes.
SYSTEM_NETWORK_BYTES_IN SYSTEM_NETWORK_BYTES_OUT	Network throughput in bytes per second.
SWAP_USAGE_USED SWAP_USAGE_FREE	Total amount swap space in use.

Disk Measurements

DISK_PARTITION_IOPS_READ DISK_PARTITION_IOPS_WRITE DISK_PARTITION_IOPS_TOTAL	Number of Input/Output operations for the disk partition that hosts MongoDB. Requires Ops Manager Automation.
DISK_PARTITION_UTILIZATION	Percentage of time when the partition issues and services requests. This includes requests from any process, not just MongoDB processes. Requires Ops Manager Automation.
DISK_PARTITION_LATENCY_READ DISK_PARTITION_LATENCY_WRITE	Latency per operation type of the disk partition that hosts MongoDB. Requires Ops Manager Automation.
DISK_PARTITION_SPACE_FREE DISK_PARTITION_SPACE_USED DISK_PARTITION_SPACE_PERCENT_FREE DISK_PARTITION_SPACE_PERCENT_USED	Measures the free disk space and used disk space on the disk partition used by MongoDB. Only available if you use Ops Manager Automation.

Database Measurements

DATABASE_WRITE_LOCK_PERCENTAGE

Duration that the host is write locked.

DATABASE_AVERAGE_OBJECT_SIZE DATABASE_COLLECTION_COUNT DATABASE_DATA_SIZE DATABASE_FILE_SIZE DATABASE_STORAGE_SIZE DATABASE_INDEX_SIZE DATABASE_INDEX_COUNT DATABASE_EXTENT_COUNT DATABASE_OBJECT_COUNT

Amount of disk storage that database uses on-disk storage space found from the MongoDB dbStats command. By default, the Monitoring retrieves database measurements every 20 minutes but adjusts frequency when necessary to reduce the impact on database performance. To disable collecting database statistics in the Ops Manager, click Settings, then click Group Settings, and then set Collect Database Specific Statistics to No.

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