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

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
--mongodb.collstats-colls	List of comma separated databases.collections to get stats	--mongodb.collstats-colls=testdb.testcol1,testdb.testcol2
--mongodb.indexstats-colls	List of comma separated database.collections to get index stats	--mongodb.indexstats-colls=db1.col1,db1.col2
--mongodb.dsn	MongoDB connection URI	--mongodb.dsn=mongodb://user:[email protected]:27017/admin?ssl=true
--expose-path	Metrics expose path	--expose-path=/metrics_new
--expose-port	HTTP expose server port	--expose-port=9216
-D, --debug	Enable debug mode
--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 build and the new binaries will be generated under the build directory.

├── build  
│ ├── config.yaml  
│ ├── mnogo_exporter_7c73946_checksums.txt  
│ ├── mnogo_exporter-7c73946.darwin-amd64.tar.gz  
│ ├── mnogo_exporter-7c73946.linux-amd64.tar.gz  
│ ├── mnogo_exporter_darwin_amd64  
│ │ └── mnogo_exporter <--- MacOS binary  
│ └── mnogo_exporter_linux_amd64  
│ └── mnogo_exporter <--- Linux binary  

Build the exporter

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

├── build  
│ ├── config.yaml  
│ ├── mnogo_exporter_7c73946_checksums.txt  
│ ├── mnogo_exporter-7c73946.darwin-amd64.tar.gz  
│ ├── mnogo_exporter-7c73946.linux-amd64.tar.gz  
│ ├── mnogo_exporter_darwin_amd64  
│ │ └── mnogo_exporter <--- MacOS binary  
│ └── mnogo_exporter_linux_amd64  
│ └── mnogo_exporter <--- Linux binary  

Running the exporter

If you built the exporter using the method mentioned in the previous section, the generated binaries are in mnogo_exporter_linux_amd64/mnogo_exporter or mnogo_exporter_darwin_amd64/mnogo_exporter

Example

mnogo_exporter_linux_amd64/mnogo_exporter --mongodbdsn=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

mnogo_exporter_linux_amd64/mnogo_exporter --mongodbdsn=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