Prerequisites - Signoz

Before You Begin

To configure metrics and logs collection for MongoDB, you need the following.

Ensure that the MongoDB server is running a supported version
MongoDB versions 4.4+ are supported.
You can use the following statement to determine server version
js
```
db.version()
```
If collecting metrics, ensure that there is a MongoDB user with required permissions
Mongodb recommends to set up a least privilege user (LPU) with a clusterMonitor role in order to collect metrics

To create a monitoring user, run:
js
```
use admin
db.createUser(
  {
    user: "monitoring",
    pwd: "<PASSWORD>",
    roles: ["clusterMonitor"]
  }
);
```

Ensure that an OTEL collector is running in your deployment environment
If needed, please install an OTEL Collector
If already installed, ensure that the collector version is v0.88.0 or newer.

Also ensure that you can provide config files to the collector and that you can set environment variables and command line flags used for running it.
Ensure that the OTEL collector can access the MongoDB server
In order to collect metrics, the collector must be able to access the MongoDB server as a client using the monitoring user.

In order to collect logs, the collector must be able to read the MongoDB server log file.