@opentelemetry/instrumentation-mongodb

What is @opentelemetry/instrumentation-mongodb?

@opentelemetry/instrumentation-mongodb is an npm package that provides automatic tracing for MongoDB operations using the OpenTelemetry framework. It helps in monitoring and collecting performance metrics and distributed traces for MongoDB operations, which can be useful for debugging and optimizing database interactions.

What are @opentelemetry/instrumentation-mongodb's main functionalities?

Automatic Tracing

This feature allows you to automatically trace MongoDB operations. The code sample shows how to set up the NodeTracerProvider and register the MongoDB instrumentation to start collecting traces.

const { NodeTracerProvider } = require('@opentelemetry/node');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');
const { MongoDBInstrumentation } = require('@opentelemetry/instrumentation-mongodb');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new MongoDBInstrumentation(),
  ],
});

Custom Span Attributes

This feature allows you to add custom attributes to the spans created for MongoDB operations. The code sample demonstrates how to use the `responseHook` to add the MongoDB operation result as a span attribute.

const { MongoDBInstrumentation } = require('@opentelemetry/instrumentation-mongodb');

const mongoInstrumentation = new MongoDBInstrumentation({
  responseHook: (span, result) => {
    span.setAttribute('mongodb.result', JSON.stringify(result));
  },
});

Error Handling

This feature allows you to handle errors in MongoDB operations and set the span status accordingly. The code sample shows how to use the `responseHook` to check if the result is an error and set the span status.

const { MongoDBInstrumentation } = require('@opentelemetry/instrumentation-mongodb');

const mongoInstrumentation = new MongoDBInstrumentation({
  responseHook: (span, result) => {
    if (result instanceof Error) {
      span.setStatus({ code: 2, message: result.message });
    }
  },
});

Other packages similar to @opentelemetry/instrumentation-mongodb

mongodb

The `mongodb` package is the official MongoDB driver for Node.js. While it does not provide automatic tracing, it is often used in conjunction with tracing libraries like OpenTelemetry to manually instrument MongoDB operations.

mongoose

Mongoose is an ODM (Object Data Modeling) library for MongoDB and Node.js. It provides a higher-level abstraction for MongoDB operations but does not include built-in tracing capabilities. However, it can be instrumented using OpenTelemetry for tracing.

@opentelemetry/instrumentation-http

This package provides automatic tracing for HTTP requests. While it is not specific to MongoDB, it can be used alongside @opentelemetry/instrumentation-mongodb to provide a more comprehensive tracing solution for applications that interact with MongoDB over HTTP.

README

OpenTelemetry MongoDB Instrumentation for Node.js

This module provides automatic instrumentation for the mongodb module, which may be loaded using the @opentelemetry/sdk-trace-node package and is included in the @opentelemetry/auto-instrumentations-node bundle.

If total installation size is not constrained, it is recommended to use the @opentelemetry/auto-instrumentations-node bundle with @opentelemetry/sdk-node for the most seamless instrumentation experience.

Compatible with OpenTelemetry JS API and SDK 1.0+.

Installation

npm install --save @opentelemetry/instrumentation-mongodb

Supported Versions

• mongodb version >=3.3.0 <7

Usage

OpenTelemetry MongoDB Instrumentation allows the user to automatically collect trace data and export them to their backend of choice, to give observability to distributed systems.

To load a specific instrumentation (mongodb in this case), specify it in the Node Tracer's configuration.

const { MongoDBInstrumentation } = require('@opentelemetry/instrumentation-mongodb');
const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new MongoDBInstrumentation({
      // see under for available configuration
    }),
  ],
});

See examples/mongodb for a short example.

Mongo instrumentation Options

Mongodb instrumentation has few options available to choose from. You can set the following:

Options	Type	Description
enhancedDatabaseReporting	string	If true, additional information about query parameters and results will be attached (as attributes) to spans representing database operations
responseHook	MongoDBInstrumentationExecutionResponseHook (function)	Function for adding custom attributes from db response
dbStatementSerializer	DbStatementSerializer (function)	Custom serializer function for the db.statement tag

Semantic Conventions

This package uses @opentelemetry/semantic-conventions version 1.22+, which implements Semantic Convention Version 1.7.0

Attributes collected:

Attribute	Short Description
db.system	An identifier for the database management system (DBMS) product being used.
db.connection_string	The connection string used to connect to the database.
db.name	This attribute is used to report the name of the database being accessed.
db.operation	The name of the operation being executed.
db.mongodb.collection	The collection being accessed within the database stated in db.name.
net.peer.name	Remote hostname or similar.
net.peer.port	Remote port number.

Useful links

• For more information on OpenTelemetry, visit: https://opentelemetry.io/
• For more about OpenTelemetry JavaScript: https://github.com/open-telemetry/opentelemetry-js
• For help or feedback on this project, join us in GitHub Discussions

License

Apache 2.0 - See LICENSE for more information.