Get Measurements for a MongoDB Process
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Groups and projects are synonymous terms. Your {GROUP-ID} is the
same as your project ID. For existing groups, your group/project ID
remains the same. The resource and corresponding endpoints use the
term groups.
Get measurements for a specific Atlas MongoDB process. An Atlas MongoDB process can be either a mongod or mongos.
To calculate some metric series, Atlas takes the rate between every two adjacent points. For these metric series, the first data point has a null value because Atlas can't calculate a rate for the first data point given the query time range.
The Atlas Administration API authenticates using HTTP Digest Authentication. Provide a programmatic API public key and corresponding private key as the username and password when constructing the HTTP request. To learn how to configure API access for an Atlas project, see Get Started with the Atlas Administration API.
Resource
Base URL: https://cloud.mongodb.com/api/atlas/v1.0
GET /groups/{GROUP-ID}/processes/{HOST}:{PORT}/measurements
Request Path Parameters
Parameter | Type | Necessity | Description |
|---|---|---|---|
GROUP-ID | string | Required | Unique 24-hexadecimal digit string that identifies the project
that owns this Atlas MongoDB process. |
HOST | string | Required | Hostname, FQDN, IPv4 address, or IPv6 address of the
machine running the Atlas MongoDB process. |
PORT | number | Required | IANA port to which the Atlas MongoDB process listens. |
Request Query Parameters
Name | Type | Necessity | Description | Default |
|---|---|---|---|---|
pageNum | integer | Optional | Page number, starting with one, that Atlas returns of the
total number of objects. | 1 |
itemsPerPage | integer | Optional | Number of items that Atlas returns per page, up to a maximum
of 500. | 100 |
includeCount | boolean | Optional | Flag that indicates whether Atlas returns the totalCount
parameter in the response body. | true |
pretty | boolean | Optional | Flag that indicates whether Atlas returns the JSON
response in the
prettyprint format. | false |
envelope | boolean | Optional | Flag that indicates whether Atlas wraps the response in an envelope. Some API clients cannot access the HTTP response headers or
status code. To remediate this, set Endpoints that return a list of results use the results object as an envelope. Atlas adds the status parameter to the response body. | false |
granularity | string | Required | Duration in ISO 8601 notation that specifies the interval between measurement data points. Example PT1M specifies 1-minute granularity. Atlas supports the following subset of ISO 8601-formatted time periods:
When you specify granularity, you must specify either period or start and end. Atlas retrieves database metrics every 20 minutes by default. Results include data points with 20 minute intervals. To learn more, see View MongoDB Processes. | ||
|---|---|---|---|---|---|
period | string | Required | Duration in ISO 8601 notation that specifies the length of time in the past to query. Mutually exclusive with start and end. Example To request the last 36 hours, specify: period=P1DT12H. | ||
start | string | Required | Timestamp in ISO 8601 date and time format in UTC when to start retrieving measurements. If you
specify start you must also specify end. Mutually
exclusive with period. | ||
end | string | Required | Timestamp in ISO 8601 date and time format in UTC when to stop retrieving measurements. If you specify end you must also specify start. Mutually exclusive with period. | ||
m | string | Optional | Type of measurements this endpoint return. If you don't set m, the endpoint returns all measurements. To specify multiple values for m, you must repeat the m parameter. Example You must specify measurements that are valid for the host. Atlas returns an error if any specified measurements are invalid. The Measurement Values section details these metrics. |
Request Body Parameters
This endpoint doesn't use HTTP request body parameters.
Response Elements
M0/M2/M5 clusters return a subset of the metrics documented.
If you set the query parameter to envelope=true, the resource wraps the response in a content object.
The HTTP response returns a JSON document that includes the following objects:
Name | Type | Description |
|---|---|---|
end | string | Timestamp in ISO 8601 date and time format in UTC when to stop retrieving measurements. |
granularity | string | Duration in ISO 8601 notation that specifies the interval between
measurement data points. |
groupId | string | Unique 24-hexadecimal digit string that identifies the project
that owns the Atlas MongoDB process. |
hostId | string | Hostname and port of the host running the Atlas MongoDB
process. |
links | array | One or more links to sub-resources and/or related resources. The relations between URLs are explained in the Web Linking Specification |
measurements | array | List of measurements recorded and their data points. |
measurements .dataPoints | array | Value of and metadata provided for one data point. If Atlas
has no data point for a particular moment in time, the value
field is set to null. |
measurements .dataPoints .timestamp | string | Timestamp in ISO 8601 date and time format in UTC when this time interval that this data point
represents began. |
measurements .dataPoints .value | number | Value this data point provides. |
measurements .name | string | Name of the measurement that this data point covers. The Measurement Values section details these metrics. |
measurements .units | string | Magnitude by which Atlas quanitifies the measurement. |
processId | string | Hostname and port of the machine running the Atlas
MongoDB process. |
start | string | Timestamp in ISO 8601 date and time format in UTC when to start retrieving measurements. |
Measurement Values
PROCESS_CPU_USER MAX_PROCESS_CPU_USER PROCESS_CPU_KERNEL MAX_PROCESS_CPU_KERNEL PROCESS_CPU_CHILDREN_USER MAX_PROCESS_CPU_CHILDREN_USER PROCESS_CPU_CHILDREN_KERNEL MAX_PROCESS_CPU_CHILDREN_KERNEL | MongoDB CPU usage. For hosts with more than one CPU core,
these values can exceed 100%. |
|---|---|
PROCESS_NORMALIZED_CPU_USER MAX_PROCESS_NORMALIZED_CPU_USER PROCESS_NORMALIZED_CPU_KERNEL MAX_PROCESS_NORMALIZED_CPU_KERNEL PROCESS_NORMALIZED_CPU_CHILDREN_USER MAX_PROCESS_NORMALIZED_CPU_CHILDREN_USER PROCESS_NORMALIZED_CPU_CHILDREN_KERNEL MAX_PROCESS_NORMALIZED_CPU_CHILDREN_KERNEL | MongoDB CPU usage scaled to a range of 0% to 100%. Atlas
computes this value by dividing by the number of CPU cores. |
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. Cloud 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_SLAVE_LAG_MASTER_TIME OPLOG_MASTER_TIME OPLOG_MASTER_LAG_TIME_DIFF OPLOG_RATE_GB_PER_HOUR | Durations and throughput of the MongoDB process'
oplog. |
DB_STORAGE_TOTAL DB_DATA_SIZE_TOTAL | Number of database operations on a MongoDB process since the
process last started. |
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. |
RESTARTS_IN_LAST_HOUR | Number of times the host restarted within the previous hour. |
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. |
SYSTEM_CPU_USER MAX_SYSTEM_CPU_USER SYSTEM_CPU_KERNEL MAX_SYSTEM_CPU_KERNEL SYSTEM_CPU_NICE MAX_SYSTEM_CPU_KERNEL SYSTEM_CPU_IOWAIT MAX_SYSTEM_CPU_IOWAIT SYSTEM_CPU_IRQ MAX_SYSTEM_CPU_IRQ SYSTEM_CPU_SOFTIRQ MAX_SYSTEM_CPU_SOFTIRQ SYSTEM_CPU_GUEST MAX_SYSTEM_CPU_GUEST SYSTEM_CPU_STEAL MAX_SYSTEM_CPU_STEAL | CPU usage of processes on the host. For hosts with more
than one CPU core, this value can exceed 100%. |
SYSTEM_NORMALIZED_CPU_USER MAX_SYSTEM_NORMALIZED_CPU_USER SYSTEM_NORMALIZED_CPU_KERNEL MAX_SYSTEM_NORMALIZED_CPU_KERNEL SYSTEM_NORMALIZED_CPU_NICE MAX_SYSTEM_NORMALIZED_CPU_NICE SYSTEM_NORMALIZED_CPU_IOWAIT MAX_SYSTEM_NORMALIZED_CPU_IOWAIT SYSTEM_NORMALIZED_CPU_IRQ MAX_SYSTEM_NORMALIZED_CPU_IRQ SYSTEM_NORMALIZED_CPU_SOFTIRQ MAX_SYSTEM_NORMALIZED_CPU_SOFTIRQ SYSTEM_NORMALIZED_CPU_GUEST MAX_SYSTEM_NORMALIZED_CPU_GUEST SYSTEM_NORMALIZED_CPU_STEAL MAX_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. |
SYSTEM_MEMORY_AVAILABLE MAX_SYSTEM_MEMORY_AVAILABLE SYSTEM_MEMORY_BUFFERS MAX_SYSTEM_MEMORY_BUFFERS SYSTEM_MEMORY_CACHED MAX_SYSTEM_MEMORY_CACHED SYSTEM_MEMORY_FREE MAX_SYSTEM_MEMORY_FREE SYSTEM_MEMORY_SHARED MAX_SYSTEM_MEMORY_SHARED SYSTEM_MEMORY_USED MAX_SYSTEM_MEMORY_USED | Physical memory usage, in bytes, that the host uses. |
SYSTEM_NETWORK_IN MAX_SYSTEM_NETWORK_IN SYSTEM_NETWORK_OUT MAX_SYSTEM_NETWORK_OUT | Average rate of physical bytes per second that the eth0
network interface received and transmitted. |
SWAP_USAGE_USED MAX_SWAP_USAGE_USED SWAP_USAGE_FREE MAX_SWAP_USAGE_FREE | Total amount of memory that swap uses. |
SWAP_IO_IN MAX_SWAP_IO_IN SWAP_IO_OUT MAX_SWAP_IO_OUT | Total amount of memory written and read from swap. |
FTS_MEMORY_RESIDENT FTS_MEMORY_VIRTUAL FTS_MEMORY_MAPPED | Memory usage, in bytes, that What is MongoDB Atlas Search? processes use. |
FTS_DISK_UTILIZATION | Disk space, in bytes, that What is MongoDB Atlas Search? indexes use. |
FTS_PROCESS_CPU_USER FTS_PROCESS_CPU_KERNEL FTS_PROCESS_NORMALIZED_CPU_USER FTS_PROCESS_NORMALIZED_CPU_KERNEL | Percentage of CPU that What is MongoDB Atlas Search? processes use. |
Example Request
The following example request sets a granularity and period of
one minute. Replace the information in brackets {} with your own
Atlas information to execute this example request:
curl --user "{PUBLIC-KEY}:{PRIVATE-KEY}" --digest \ --header "Content-Type: application/json" \ --include \ --request GET "https://cloud.mongodb.com/api/atlas/v1.0/groups/{GROUP-ID}/processes/{HOST}:{PORT}/measurements?granularity=PT1M&period=PT1M&pretty=true"
Example Response
Response Header
401 Unauthorized Content-Type: application/json;charset=ISO-8859-1 Date: {dateInUnixFormat} WWW-Authenticate: Digest realm="MMS Public API", domain="", nonce="{nonce}", algorithm=MD5, op="auth", stale=false Content-Length: {requestLengthInBytes} Connection: keep-alive
200 OK Vary: Accept-Encoding Content-Type: application/json Strict-Transport-Security: max-age=300 Date: {dateInUnixFormat} Connection: keep-alive Content-Length: {requestLengthInBytes}
Response Body
1 { 2 "end" : "2021-04-09T20:31:14Z", 3 "granularity" : "PT1M", 4 "groupId" : "{GROUP-ID}", 5 "hostId" : "shard-00-00.mongodb.net:27017", 6 "links":[], 7 "measurements" : [ 8 { 9 "dataPoints": [ 10 { 11 "timestamp": "2021-04-09T10:06:15Z", 12 "value": 0.0 13 } 14 ], 15 "name": "QUERY_EXECUTOR_SCANNED", 16 "units": "SCALAR_PER_SECOND" 17 },{ 18 "dataPoints": [ 19 { 20 "timestamp": "2021-04-09T10:06:15Z", 21 "value": 6.866666666666666 22 } 23 ], 24 "name": "QUERY_EXECUTOR_SCANNED_OBJECTS", 25 "units": "SCALAR_PER_SECOND" 26 },{ 27 "dataPoints": [ 28 { 29 "timestamp": "2021-04-09T10:06:15Z", 30 "value": 0.0 31 } 32 ], 33 "name": "QUERY_TARGETING_SCANNED_PER_RETURNED", 34 "units": "SCALAR" 35 },{ 36 "dataPoints": [ 37 { 38 "timestamp": "2021-04-09T10:06:15Z", 39 "value": 1.0147783251231526 40 } 41 ], 42 "name": "QUERY_TARGETING_SCANNED_OBJECTS_PER_RETURNED", 43 "units": "SCALAR" 44 } 45 ], 46 "processId" : "shard-00-00.mongodb.net:27017", 47 "start" : "2021-04-09T20:30:45Z" 48 }