Both Metrics and Observations in Spring

[tushar-sharma]

I followed the Spring's documentation to see traces in Mongodb by adding the bean

@Bean
MongoClientSettingsBuilderCustomizer mongoMetricsSynchronousContextProvider(ObservationRegistry registry) {
    return (clientSettingsBuilder) -> {
        clientSettingsBuilder.contextProvider(ContextProviderFactory.create(registry))
                             .addCommandListener(new MongoObservationCommandListener(registry));
    };
}

and adding the following properties to :

# Disable Spring Boot's autoconfigured tracing
management.metrics.mongo.command.enabled=false
# Enable it manually
management.tracing.enabled=true

I can see the traces in the zipkins. However my question was since, Spring Already provides an autoconfiguration class metrics MongoAutoConfiguration.

@AutoConfiguration(before = MongoAutoConfiguration.class,
        after = { MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class })
@ConditionalOnClass(MongoClientSettings.class)
@ConditionalOnBean(MeterRegistry.class)
public class MongoMetricsAutoConfiguration {

    @ConditionalOnClass(MongoMetricsCommandListener.class)
    @ConditionalOnProperty(name = "management.metrics.mongo.command.enabled", havingValue = "true",
            matchIfMissing = true)
    static class MongoCommandMetricsConfiguration {

    

        @Bean
        MongoClientSettingsBuilderCustomizer mongoMetricsCommandListenerClientSettingsBuilderCustomizer(
                MongoMetricsCommandListener mongoMetricsCommandListener) {
            return (clientSettingsBuilder) -> clientSettingsBuilder.addCommandListener(mongoMetricsCommandListener);
        }

Why do we need to disable bean from MongoAutoConfiguration? Can’t we got both metrics and traces?

[mp911de]

MongoMetricsCommandListener is a component that registers timers to capture runtime durations of commands. MongoObservationCommandListener captures not only timing, but also spans by using Micrometer's Observation API.

If you enable both, then you will have two places for timers.