MongoDB monitoring migration guide

Metrics from the legacy MongoCollectionSample are reported under the prefix mongodb_collstats_.

These specific dimensions have been added: database and collection. Use them to narrow down your queries to a specific database and/or collection.

Collection metrics report latency metrics per collection under the prefix mongodb_collstats_latencyStats_.

This is an example of query:

FROM Metric SELECT latest(mongodb_collstats_storageStats_size) WHERE database='DB1' AND collection='Collection1'

Metrics from the legacy MongoConfigServerSample are reported under the prefix mongodb_ss_ (Server Stats) with the cl_role dimension populated with an empty value.

There're several specific dimensions added depending on the metric. Check which dimensions are assigned to each metric.

This is an example of query to retrieve the latest status on server connections:

FROM Metric SELECT latest(mongodb_ss_connections) FACET conn_type

Metrics from the legacy MongoDatabaseSample are reported under the prefix mongodb_dbstats_.

You can use the database dimension to narrow down your queries to a specific database.

FROM Metric SELECT uniqueCount(database) WHERE mongodb_cluster_name='your_cluster'

Metrics from the legacy MongodTopSample are reported under the prefix mongodb_top_.

You can use the database and collection dimensions to narrow down your queries to a specific database and/or collection.

This is an example of query to get a time series of the frequency of insert commands:

SELECT derivative(mongodb_top_insert_time, 1 minute) / 1000 AS 'Inserts' Metric WHERE mongodb_cluster_name='your_cluster' TIMESERIES

Mongo Sample reports the totalDatabases metric, which hasn't direct correspondence on the new integration.

To retrieve the total number of databases, see this example:

FROM Metric SELECT uniqueCount(database) WHERE mongodb_cluster_name='your_cluster'

Mongod metrics are the same as Config Server metrics but the cl_role dimension is populated with a value of shardsvr.

Mongos metrics are the same as Config Server metrics but the cl_role dimension is populated with a value of mongos.