MongoDB exporter

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

release-0.1x

A flag,

--compatible-mode

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|| |--enable.top|Enable collecting metrics from top admin command|| |--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

├── 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 

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 mongodbsswtloglogbyteswritten serverStatus.wiredTiger.log.

TYPE mongodbsswtloglogbyteswritten untyped

mongodbsswtloglogbyteswritten 2.6208e+06
will be also exposed as `mongodb_mongod_wiredtiger_log_bytes_total`  with the `unwritten` label.

HELP mongodbmongodwiredtigerlogbytestotal mongodbmongodwiredtigerlogbytestotal

TYPE mongodbmongodwiredtigerlogbytes_total untyped

mongodbmongodwiredtigerlogbytes_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