Enable Observability at MongoDB

Tags: spring-boot mongodb observability

Written by: Tushar Sharma

Implementing Observability in Reactive MongoDB with Spring Boot and Testcontainers

Introduction to Observability

Observability is the cornerstone of modern distributed systems, enabling developers to:

• Trace request flows through microservices

• Measure system performance via metrics

• Diagnose issues using structured logs

In reactive MongoDB applications, observability becomes crucial due to:

• Non-blocking nature complicating request tracing

• Connection pooling challenges

• Complex query performance analysis

The Three Observability Pillars

1. Metrics: Quantitative measurements (e.g., query duration)

2. Traces: Distributed request context propagation

3. Logs: Contextual event records

AutoConfigure class

Let’s create an autoconfigure class that will be loaded automatically when the dependency is added in build.gradle:

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb-reactive'
}

Make sure to register this class in META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports for Spring Boot to pick it up automatically.

Key Components:

• @AutoConfigureAfter: Ensures proper configuration ordering

• MongoClientSettingsBuilderCustomizer: Injects observability instrumentation

• ContextProvider: Propagates tracing context through reactive pipelines

Integration Testing

We can use Testcontainers for testing traces.

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