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add support for OTEL_RESOURCE_ATTRIBUTES, OTEL_SERVICE_NAME, OTEL_EXPORTER_OTLP_HEADERS and OTEL_EXPORTER_OTLP_PROTOCOL for spring boot starter #9950

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merged 17 commits into from
Dec 21, 2023

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zeitlinger
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@zeitlinger zeitlinger commented Nov 24, 2023

Fixes #8191

it's also possible to add the header in in application.yml as a yaml map.

otel:
  exporter:
    otlp:
      header:
        foo: bar

@zeitlinger zeitlinger requested a review from a team as a code owner November 24, 2023 15:51
@zeitlinger zeitlinger changed the title add support for OTEL_EXPORTER_OTLP_HEADERS for spring boot starter add support for OTEL_EXPORTER_OTLP_HEADERS and OTEL_EXPORTER_OTLP_PROTOCOL for spring boot starter Nov 24, 2023
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Could you please add a test for the new feature (I have not found it)?

@@ -51,6 +53,12 @@ public class OpenTelemetryAutoConfiguration {

public OpenTelemetryAutoConfiguration() {}

@Bean
@ConfigurationPropertiesBinding
public MapConverter mapConverter() {
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Could this bean be moved to the OpenTelemetrySdkConfig class? I don't follow how it works. mapConverter bean does not seem to be injected into the OTel code and I don't see how Spring coud reuse this bean. Could you please add a comment?

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I don't follow where the mapConverter bean is injected and used. Is the mapConverter bean really used (are the tests green without this bean)? The parsing is not done in the OtlpExporterUtil class?

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This test fails when the converter is removed:

https://github.com/zeitlinger/opentelemetry-java-instrumentation/blob/4bf15ad6529789eb848f609bf78ae2c96fc04103/instrumentation/spring/spring-boot-autoconfigure/src/test/java/io/opentelemetry/instrumentation/spring/autoconfigure/exporters/otlp/OtlpSpanExporterAutoConfigurationTest.java#L109

This is the error message:

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'otelOtlpSpanExporter' defined in io.opentelemetry.instrumentation.spring.autoconfigure.exporters.otlp.OtlpSpanExporterAutoConfiguration: Unsatisfied dependency expressed through method 'otelOtlpSpanExporter' parameter 0; nested exception is org.springframework.boot.context.properties.ConfigurationPropertiesBindException: Error creating bean with name 'otel.exporter.otlp-io.opentelemetry.instrumentation.spring.autoconfigure.exporters.otlp.OtlpExporterProperties': Could not bind properties to 'OtlpExporterProperties' : prefix=otel.exporter.otlp, ignoreInvalidFields=false, ignoreUnknownFields=true; nested exception is org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'otel.exporter.otlp.headers' to java.util.Map<java.lang.String, java.lang.String>

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I got it now.

Could you please update the code to:

  • Move the mapConverter bean to an autoconfiguration only related to OTLP (just realized that it's OTLP specific)
  • Only create the mapConverter bean when OTLP is enabled
  • Perhaps add a comment to explain that the mapConverter bean is necessary for the OtlpExporterProperties component?

Thank you!

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I added comments in the different places.

I tried to make the converter local, but that doesn't work:

for bean 'mapConverter' since there is already [Root bean: class [null]; scope=; abstract=false; lazyInit=null; autowireMode=3; dependencyCheck=0;

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Could you please give the piece of code you have added and the stack trace?

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@jeanbisutti I've added support for OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME as well now.

And I've figured out a way to make the converter conditional:

    @Bean
    @ConfigurationPropertiesBinding
    @ConditionalOnBean({OtelResourceAutoConfiguration.class, OtlpLoggerExporterAutoConfiguration.class,
        OtlpSpanExporterAutoConfiguration.class, OtlpMetricExporterAutoConfiguration.class})
    public MapConverter mapConverter() {
      // needed for otlp exporter headers and OtelResourceProperties
      return new MapConverter();
    }

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The mapConverter bean is still in the OpenTelemetryAutoConfiguration class whose responsibility is to instantiate an OpenTelemetry bean.

You could create the mapConverter bean with an OTLP-related autoconfiguration.

OtlpLoggerExporterAutoConfiguration, OtlpLoggerExporterAutoConfiguration, OtlpSpanExporterAutoConfiguration are examples of autoconfiguration.

The autoconfiguration classes have to be declared in the spring.factories (<Spring Boot 2.7) org.springframework.boot.autoconfigure.AutoConfiguration.imports (>=Spring Boot 2.7) files.

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it's also used to parse otel.resource.attributes - which can be seen in the javadoc of the class

}

return builder.build();
@ConditionalOnMissingBean({OtlpGrpcSpanExporter.class, OtlpHttpSpanExporter.class})
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What about if the user adds another type of span exporter (for logging by example)?

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see below

}

return builder.build();
@ConditionalOnMissingBean({OtlpGrpcMetricExporter.class, OtlpHttpMetricExporter.class})
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What about if the user adds another type of span exporter (for logging by example)?

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@zeitlinger
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Could you please add a test for the new feature (I have not found it)?

can you help me decide which test style would fit here?
unit tests with spring don't give much safaty. maybe a smoke test?

@jeanbisutti
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You have two possibilities:

Personally, I'd prefer the first option in this case because the smoke tests could become difficult to read if we check to many features (only one Spring Boot app for the smoke tests).

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Personally, I'd prefer the first option in this case because the smoke tests could become difficult to read if we check to many features (only one Spring Boot app for the smoke tests).

thanks for the help - and I agree.

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@jeanbisutti can you have another look?

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@jeanbisutti can you have another look?

@zeitlinger Done

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thx! can you add doc for this?

@zeitlinger
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thx! can you add doc for this?

done

@zeitlinger zeitlinger changed the title add support for OTEL_EXPORTER_OTLP_HEADERS and OTEL_EXPORTER_OTLP_PROTOCOL for spring boot starter add support for OTEL_RESOURCE_ATTRIBUTES, OTEL_SERVICE_NAME, OTEL_EXPORTER_OTLP_HEADERS and OTEL_EXPORTER_OTLP_PROTOCOL for spring boot starter Dec 13, 2023
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@jeanbisutti final review?

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@jeanbisutti all done 😄

| Otlp Logs Exporter | otel.exporter.otlp.logs.enabled | `true` | OtlpGrpcLogRecordExporter |
| Jaeger Exporter | otel.exporter.jaeger.enabled | `true` | JaegerGrpcSpanExporter |
| Zipkin Exporter | otel.exporter.zipkin.enabled | `true` | ZipkinSpanExporter |
| Logging Exporter | otel.exporter.logging.enabled | `false` | LoggingSpanExporter |
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Why the default value of the otel.exporter.logging.enabled property has been changed from true to false?

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it's not changed, the doc was wrong

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oh, right, we should change it for 2.0, similar to #10055

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this is the exporter for console logging, not otlp logging

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oh, right, thx!

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Thanks!


`unknown_service:java` will be used as the service-name if no value has been specified to the
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It would be great to keep this information to help users diagnose this issue

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@trask trask added this to the v2.0 milestone Dec 14, 2023
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@jeanbisutti ready for approval 😄

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@jeanbisutti ready for approval 😄

@zeitlinger I have approved

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Align spring boot starter configuration properties with SDK autoconfigure properties
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