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MongoDB exporter

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This is the new MongoDB exporter implementation that handles ALL metrics exposed by MongoDB monitoring commands. This new implementation loops over all the fields exposed in diagnostic commands and tries to get data from them.

Currently, these metric sources are implemented:

  • $collStats
  • $indexStats
  • getDiagnosticData
  • replSetGetStatus
  • serverStatus

Info on Percona MongoDB exporter versions

The old 0.1x.y version (ex master branch) has been moved to the release-0.1x branch.

A flag, --compatible-mode, which exposes metrics with 0.1x compatible metric names has been implemented which simplifies migration from the old version to the current version.

Flags

Flag Description Example
-h, --help Show context-sensitive help
--compatible-mode Exposes new metrics in the new and old format at the same time
--discovering-mode Enable autodiscover collections from databases which set in collstats-colls and indexstats-colls
--mongodb.collstats-colls List of comma separated databases.collections to get stats --mongodb.collstats-colls=testdb.testcol1,testdb.testcol2
--mongodb.direct-connect Whether or not a direct connect should be made. Direct connections are not valid if multiple hosts are specified or an SRV URI is used --mongodb.direct-connect=false
--mongodb.indexstats-colls List of comma separated database.collections to get index stats --mongodb.indexstats-colls=db1.col1,db1.col2
--mongodb.uri MongoDB connection URI ($MONGODB_URI) --mongodb.uri=mongodb://user:[email protected]:27017/admin?ssl=true
--mongodb.global-conn-pool Use global connection pool instead of creating new connection for each http request.
--web.listen-address Address to listen on for web interface and telemetry --web.listen-address=":9216"
--web.telemetry-path Metrics expose path --web.telemetry-path="/metrics"
--log.level Only log messages with the given severity or above. Valid levels: [debug, info, warn, error] --log.level=error
--no-collector.diagnosticdata Disable collecting metrics from getDiagnosticData
--no-collector.replicasetstatus Disable collecting metrics from replSetGetStatus
--collector.dbstats Enable collecting metrics from dbStats
--collector.topmetrics Enable collecting metrics from top admin command
--metrics.overridedescendingindex Enable descending index name override to replace -1 with _DESC
--version Show version and exit

Build the exporter

The build process uses the dockerized version of goreleaser so you don't need to install Go. Just run make release and the new binaries will be generated under the build directory.

├── build
│ ├── config.yaml
│ ├── mongodb_exporter_7c73946_checksums.txt
│ ├── mongodb_exporter-7c73946.darwin-amd64.tar.gz
│ ├── mongodb_exporter-7c73946.linux-amd64.tar.gz
│ ├── mongodb_exporter_darwin_amd64
│ │ └── mongodb_exporter <--- MacOS binary
│ └── mongodb_exporter_linux_amd64
│ └── mongodb_exporter <--- Linux binary

Running the exporter

If you built the exporter using the method mentioned in the previous section, the generated binaries are in mongodb_exporter_linux_amd64/mongodb_exporter or mongodb_exporter_darwin_amd64/mongodb_exporter

Docker

A docker image is available on the official percona repository.

Examples
# with podman
podman run -d -p 9216:9216 -p 17001:17001 percona/mongodb_exporter:0.20 --mongodb.uri=mongodb://127.0.0.1:17001

# with docker
docker run -d -p 9216:9216 -p 17001:17001 percona/mongodb_exporter:0.20 --mongodb.uri=mongodb://127.0.0.1:17001

Permissions

Connecting user should have sufficient rights to query needed stats:

      {
         "role":"clusterMonitor",
         "db":"admin"
      },
      {
         "role":"read",
         "db":"local"
      }

More info about roles in MongoDB documentation.

Example

mongodb_exporter_linux_amd64/mongodb_exporter --mongodb.uri=mongodb://127.0.0.1:17001

Enabling collstats metrics gathering

--mongodb.collstats-colls receives a list of databases and collections to monitor using collstats. Usage example: --mongodb.collstats-colls=database1.collection1,database2.collection2

mongodb_exporter_linux_amd64/mongodb_exporter --mongodb.uri=mongodb://127.0.0.1:17001 --mongodb.collstats-colls=db1.c1,db2.c2

Enabling compatibility mode.

When compatibility mode is enabled by the --compatible-mode, the exporter will expose all new metrics with the new naming and labeling schema and at the same time will expose metrics in the version 1 compatible way. For example, if compatibility mode is enabled, the metric mongodb_ss_wt_log_log_bytes_written (new format)

# HELP mongodb_ss_wt_log_log_bytes_written serverStatus.wiredTiger.log.
# TYPE mongodb_ss_wt_log_log_bytes_written untyped
mongodb_ss_wt_log_log_bytes_written 2.6208e+06

will be also exposed as mongodb_mongod_wiredtiger_log_bytes_total with the unwritten label.

HELP mongodb_mongod_wiredtiger_log_bytes_total mongodb_mongod_wiredtiger_log_bytes_total
# TYPE mongodb_mongod_wiredtiger_log_bytes_total untyped
mongodb_mongod_wiredtiger_log_bytes_total{type="unwritten"} 2.6208e+06

Cluster role labels

The exporter sets some topology labels in all metrics. The labels are:

  • cl_role: Cluster role according to this table:
Server type Label
mongos mongos
regular instance (primary or secondary) shardsvr
arbiter shardsvr
standalone (empty string)
  • cl_id: Cluster ID
  • rs_nm: Replicaset name
  • rs_state: Replicaset state is an integer from getDiagnosticData() -> replSetGetStatus.myState. Check the official documentation for details on replicaset status values.

Submitting Bug Reports and adding new functionality

please see Contribution Guide