Reference

Host Metrics¶

`ASSERT_REGULAR` `ASSERT_WARNING` `ASSERT_MSG` `ASSERT_USER`	Measures the rate of asserts for a MongoDB process, as collected fdbcommand the MongoDB serverStatus command's `asserts` document.
`BACKGROUND_FLUSH_AVG`	Amount of data flushed in the background.
`CACHE_BYTES_READ_INTO` `CACHE_BYTES_WRITTEN_FROM` `CACHE_USAGE_DIRTY` `CACHE_USAGE_USED`	Applies to a MongoDB process's WiredTiger storage engine, as collected from the MongoDB :manual:dbcommand` command's `wiredTiger.cache` and `wiredTiger.concurrentTransactions` documents.
`CONNECTIONS` `CONNECTIONS_MAX` `CONNECTIONS_PERCENT`	Measures connections to a MongoDB process, as collected from the Mdbcommand serverStatus command's `connections` document.
`CURSORS_TOTAL_OPEN` `CURSORS_TOTAL_TIMED_OUT` `CURSORS_TOTAL_CLIENT_CURSORS_SIZE`	Measures the number of cursors for a MongoDB process, as collected from the MongoDB sdbcommand command's `metrics.cursor` document.
`DB_STORAGE_TOTAL` `DB_DATA_SIZE_TOTAL` `DB_INDEX_SIZE_TOTAL`	Measures the database's on-disk storage space, as collected from tdbcommand MongoDB dbStats command.
`LOGICAL_SIZE`	Logical size of cluster data.
`DISK_PARTITION_SPACE_USED_DATA` `DISK_PARTITION_SPACE_USED_INDEX` `DISK_PARTITION_SPACE_USED_JOURNAL` `DISK_PARTITION_UTILIZATION_DATA` `DISK_PARTITION_UTILIZATION_INDEX` `DISK_PARTITION_UTILIZATION_JOURNAL`	Measurements on the amount of disk space used on partitions containing different types of MongoDB data.
`DOCUMENT_RETURNED` `DOCUMENT_INSERTED` `DOCUMENT_UPDATED` `DOCUMENT_DELETED`	Average rate per second of documents returned, inserted, updated, or deleted for a selected time period.
`EXTRA_INFO_PAGE_FAULTS` `GLOBAL_ACCESSES_NOT_IN_MEMORY` `GLOBAL_PAGE_FAULT_EXCEPTIONS_THROWN`	Measurements on page faults related to the host.
`FTS_MEMORY_RESIDENT` `FTS_MEMORY_VIRTUAL` `FTS_MEMORY_MAPPED`	Memory usage for Atlas Search processes, in bytes.
`FTS_DISK_UTILIZATION`	Disk space in use by Atlas Search indexes, in bytes.
`FTS_PROCESS_CPU_USER` `FTS_PROCESS_CPU_KERNEL` `NORMALIZED_FTS_PROCESS_CPU_USER` `NORMALIZED_FTS_PROCESS_CPU_KERNEL`	Percentage of CPU in use by Atlas Search processes.
`GLOBAL_LOCK_CURRENT_QUEUE_TOTAL` `GLOBAL_LOCK_CURRENT_QUEUE_READERS` `GLOBAL_LOCK_CURRENT_QUEUE_WRITERS` `GLOBAL_LOCK_PERCENTAGE`	Measures operations waiting on locks, as collected from the MongoDB `serverStatus` command.
`INDEX_COUNTERS_BTREE_ACCESSES` `INDEX_COUNTERS_BTREE_HITS` `INDEX_COUNTERS_BTREE_MISSES` `INDEX_COUNTERS_BTREE_MISS_RATIO`	Measurements concerning b-tree index activity.
`JOURNALING_COMMITS_IN_WRITE_LOCK` `JOURNALING_MB` `JOURNALING_WRITE_DATA_FILES_MB`	Measurements concerning journaling activity.
`MEMORY_RESIDENT` `MEMORY_VIRTUAL` `MEMORY_MAPPED` `COMPUTED_MEMORY`	Measures memory for a MongoDB process, as collected from the MongoDB `serverStatus` command's `mem` document.
`MUNIN_CPU_USER` `MUNIN_CPU_NICE` `MUNIN_CPU_SYSTEM` `MUNIN_CPU_IOWAIT` `MUNIN_CPU_IRQ` `MUNIN_CPU_SOFTIRQ` `MUNIN_CPU_STEAL`	Measurements concerning munin-node CPU activity.
`NETWORK_BYTES_IN` `NETWORK_BYTES_OUT` `NETWORK_NUM_REQUESTS`	Measures throughput for MongoDB process, as collected from the MongoDB `serverStatus` command's `network` document.
`OPCOUNTER_CMD` `OPCOUNTER_QUERY` `OPCOUNTER_UPDATE` `OPCOUNTER_DELETE` `OPCOUNTER_GETMORE` `OPCOUNTER_INSERT`	Measures the rate of database operations on a MongoDB process since the process last started, as collected from the MongoDB `serverStatus` command's `opcounters` document.
`OPCOUNTER_REPL_CMD` `OPCOUNTER_REPL_UPDATE` `OPCOUNTER_REPL_DELETE` `OPCOUNTER_REPL_INSERT`	Measures the rate of database operations on MongoDB secondaries, as collected from the MongoDB `serverStatus` command's `opcountersRepl` document.
`OPERATIONS_SCAN_AND_ORDER`	For a selected time period, the average rate per second for operations that perform a sort but cannot perform the sort using an index.
`AVG_READ_EXECUTION_TIME` `AVG_WRITE_EXECUTION_TIME` `AVG_COMMAND_EXECUTION_TIME`	Available to hosts running MongoDB 3.6 or later. The execution time in milliseconds per read, write, or command operation over the selected time period.
`OPLOG_MASTER_TIME` `OPLOG_MASTER_TIME_ESTIMATED_TTL` `OPLOG_SLAVE_LAG_MASTER_TIME` `OPLOG_MASTER_LAG_TIME_DIFF` `OPLOG_RATE_GB_PER_HOUR`	Measurements that apply to the MongoDB process's oplog.
`QUERY_EXECUTOR_SCANNED`	Average rate per second to scan index items during queries and query-plan evaluations. This rate is driven by the same value as `totalKeysExamined` in the output of `explain`. This measurement is found on the host's `Query Executor` chart, accessed when viewing metrics.
`QUERY_EXECUTOR_SCANNED_OBJECTS`	Average rate per second to scan documents during queries and query-plan evaluations. Atlas derives the rate using the `explain` output's `totalDocsExamined` value. This measurement is found on the host's `Query Executor` chart, accessed when viewing metrics.
`QUERY_TARGETING_SCANNED_PER_RETURNED`	Ratio of the number of index items scanned to the number of documents returned. This measurement is found on the host's `Query Targeting` chart, accessed when viewing metrics.
`QUERY_TARGETING_SCANNED_OBJECTS_PER_RETURNED`	Ratio of the number of documents scanned to the number of documents returned. This measurement is found on the host's `Query Targeting` chart, accessed when viewing metrics.
`RESTARTS_IN_LAST_HOUR`	Number of times the host restarted within the previous hour.
`SWAP_USAGE_USED` `SWAP_USAGE_FREE`	Swap space used and available, measured in bytes.
`SYSTEM_MEMORY_USED` `SYSTEM_MEMORY_FREE`	Number of bytes of physical memory in use and available to the system.
`SYSTEM_MEMORY_AVAILABLE`	Estimate of the number of bytes of system memory available for running new applications, without swapping.
`SYSTEM_NETWORK_IN` `SYSTEM_NETWORK_OUT`	Average rate of physical bytes received and transmitted per second by the `eth0` network interface.
`TICKETS_AVAILABLE_READS` `TICKETS_AVAILABLE_WRITES`	Measurement of the WiredTiger storage engine `wiredTiger.cache` and `wiredTiger.concurrentTransactions` documents as collected from the MongoDB `serverStatus` dbcommand command.
`NORMALIZED_SYSTEM_CPU_USER` `NORMALIZED_SYSTEM_CPU_STEAL`	CPU usage of processes on the host server, scaled to a range of 0-100% by dividing by the number of CPU cores.

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