Host Metrics

`ASSERT_REGULAR` `ASSERT_WARNING` `ASSERT_MSG` `ASSERT_USER`	Measures the rate of asserts for a MongoDB process, as collected from 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`	Applies to a MongoDB process's WiredTiger storage engine, as collected from the MongoDB `serverStatus` command's `wiredTiger.cache` and `queues.execution` documents.
`CACHE_DIRTY_BYTES` `CACHE_USED_BYTES`	Total dirty or used bytes cached in memory for serving reads and writes.
`CONNECTIONS` `SERVERLESS_CONNECTIONS` `CONNECTIONS_PERCENT` `SERVERLESS_CONNECTIONS_PERCENT`	Measures connections to a MongoDB process, as collected from the MongoDB `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 `serverStatus` command's `metrics.cursor` document.
`DB_DATA_SIZE_TOTAL` `SERVERLESS_DATA_SIZE_TOTAL`	Sum total of the uncompressed document data in bytes across all databases, including system databases.
`DB_STORAGE_TOTAL`	Sum total of the compressed on-disk storage space allocated for document storage across all databases. Atlas retrieves database metrics every 20 minutes by default but adjusts frequency when necessary to reduce the impact on database performance.
`DB_INDEX_SIZE_TOTAL`	Sum total of the logical size in bytes (including prefix compression) of the index data across all databases.
`DB_DATA_SIZE_TOTAL_WO_SYSTEM`	Sum total of the uncompressed document data in bytes across non-system databases.
`LOGICAL_SIZE`	Logical size of cluster data.
`DISK_PARTITION_SPACE_USED_DATA` `DISK_PARTITION_READ_IOPS_DATA` `DISK_PARTITION_WRITE_IOPS_DATA` `DISK_PARTITION_READ_LATENCY_DATA` `DISK_PARTITION_WRITE_LATENCY_DATA`	Partition measurements for different types of MongoDB data.
`MAX_DISK_PARTITION_SPACE_USED_DATA` `MAX_DISK_PARTITION_READ_IOPS_DATA` `MAX_DISK_PARTITION_WRITE_IOPS_DATA` `MAX_DISK_PARTITION_READ_LATENCY_DATA` `MAX_DISK_PARTITION_WRITE_LATENCY_DATA`	Maximum values for partition measurements for different types of MongoDB data.
`DISK_PARTITION_QUEUE_DEPTH_DATA`	Average length of the queue of requests issued to the disk partition that MongoDB uses.
`MAX_DISK_PARTITION_QUEUE_DEPTH_DATA`	Maximum disk queue depth values over the time period specified by the metric granularity. Disk queue depth is the average length of the queue of requests issued to the disk partition that MongoDB uses.
`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_SHARED` `FTS_CURRENT_MEMORY` `FTS_MAX_MEMORY`	Memory usage for Atlas Search processes, in bytes.
`FTS_PROCESS_CPU_USER` `FTS_PROCESS_CPU_KERNEL` `FTS_PROCESS_DISK` `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` `SERVERLESS_NETWORK_BYTES_IN` `SERVERLESS_NETWORK_BYTES_OUT` `SERVERLESS_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` `SERVERLESS_OPCOUNTER_CMD` `SERVERLESS_OPCOUNTER_QUERY` `SERVERLESS_OPCOUNTER_UPDATE` `SERVERLESS_OPCOUNTER_DELETE` `SERVERLESS_OPCOUNTER_GETMORE` `SERVERLESS_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` `SERVERLESS_AVG_READ_EXECUTION_TIME` `SERVERLESS_AVG_WRITE_EXECUTION_TIME` `SERVERLESS_AVG_COMMAND_EXECUTION_TIME`	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. The change streams cursors that the Atlas Search process (`mongot`) uses to keep Atlas Search indexes updated can contribute to the query targeting ratio and trigger query targeting alerts if the ratio is high.
`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. The change streams cursors that the Atlas Search process (`mongot`) uses to keep Atlas Search indexes updated can contribute to the query targeting ratio and trigger query targeting alerts if the ratio is high.
`SEARCH_INDEX_SIZE`	Total size of all indexes on disk in bytes.
`SEARCH_NUMBER_OF_FIELDS_IN_INDEX`	Total number of unique fields present in the Atlas Search index.
`SEARCH_REPLICATION_LAG`	Approximate number of milliseconds that Atlas Search is behind in replicating changes from the oplog of `mongod`.
`SEARCH_OPCOUNTER_INSERT` `SEARCH_OPCOUNTER_DELETE` `SEARCH_OPCOUNTER_UPDATE` `SEARCH_OPCOUNTER_GETMORE`	Total number of Atlas Search operations.
`SEARCH_NUMBER_OF_QUERIES_TOTAL` `SEARCH_NUMBER_OF_QUERIES_ERROR` `SEARCH_NUMBER_OF_QUERIES_SUCCESS`	Total number of Atlas Search queries with each status.
`SERVERLESS_TOTAL_READ_UNITS`	Total serverless Read Processing Units (RPUs).
`SWAP_USAGE_USED` `SWAP_USAGE_FREE` `MAX_SWAP_USAGE_USED` `MAX_SWAP_USAGE_FREE`	Swap space used and available, measured in bytes.
`SYSTEM_MEMORY_USED` `SYSTEM_MEMORY_FREE` `SYSTEM_MEMORY_PERCENT_USED`	Number of bytes of physical memory in use and available to the system.
`MAX_SYSTEM_MEMORY_USED` `MAX_SYSTEM_MEMORY_FREE` `MAX_SYSTEM_MEMORY_PERCENT_USED`	Maximum system memory values in bytes.
`SYSTEM_MEMORY_AVAILABLE` `MAX_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.
`MAX_SYSTEM_NETWORK_IN` `MAX_SYSTEM_NETWORK_OUT`	Maximum values for the average rate of physical bytes (after any wire compression) sent to or from this database server per second over the selected sample period.
`TICKETS_AVAILABLE_READS` `TICKETS_AVAILABLE_WRITES`	Measurement of the WiredTiger storage engine `wiredTiger.cache` and `queues.execution` documents as collected from the MongoDB `serverStatus` 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.
`MAX_NORMALIZED_SYSTEM_CPU_USER` `MAX_NORMALIZED_SYSTEM_CPU_STEAL`	Maximum CPU usage values of all processes on the node, scaled to a range of 0-100% by dividing by the number of CPU cores.

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