mockotlpserver: compare JSON serialization form to OTel Java's "Logging OTLP JSON exporter"

[trentm]

https://opentelemetry.io/docs/languages/java/configuration/#logging-otlp-json-exporter

In mockotlpserver, some serialization decisions were made the object form of an OTLP http/json service request. That form is used in our tests, and also in some OTel JS contrib repo tests via the runTestFixture facility we added in the contrib-test-utils package. I'm curious if/how this form differs from the serialization form used by the OTel Java otlp-json exporter -- an experimental exporter for dev/debugging. If there are differences, it might be good to align.

This is low prio.

[trentm]

An example of the output, I think:

[otel.javaagent 2024-07-02 10:11:07:368 +0000] [BatchLogRecordProcessor_WorkerThread-1] INFO io.opentelemetry.exporter.logging.otlp.OtlpJsonLoggingLogRecordExporter - {"resource":{"attributes":[{"key":"container.id","value":{"stringValue":"075da3b7317ceccd6df58562684a8092040aacca8b5b0c49eacb33f1d2fe15b9"}},{"key":"deployment.environment","value":{"stringValue":"staging"}},{"key":"host.arch","value":{"stringValue":"amd64"}},{"key":"host.name","value":{"stringValue":"anti-fraud-7b498c4dcb-f5wqj"}},{"key":"os.description","value":{"stringValue":"Linux 6.5.0-41-generic"}},{"key":"os.type","value":{"stringValue":"linux"}},{"key":"process.command_args","value":{"arrayValue":{"values":[{"stringValue":"/opt/java/openjdk/bin/java"},{"stringValue":"-jar"},{"stringValue":"./app.jar"}]}}},{"key":"process.executable.path","value":{"stringValue":"/opt/java/openjdk/bin/java"}},{"key":"process.pid","value":{"intValue":"1"}},{"key":"process.runtime.description","value":{"stringValue":"Eclipse Adoptium OpenJDK 64-Bit Server VM 21.0.3+9-LTS"}},{"key":"process.runtime.name","value":{"stringValue":"OpenJDK Runtime Environment"}},{"key":"process.runtime.version","value":{"stringValue":"21.0.3+9-LTS"}},{"key":"service.instance.id","value":{"stringValue":"7e31966b-5668-4338-913a-5e2601d75e25"}},{"key":"service.name","value":{"stringValue":"anti-fraud"}},{"key":"service.namespace","value":{"stringValue":"shop"}},{"key":"service.version","value":{"stringValue":"1.1"}},{"key":"telemetry.distro.name","value":{"stringValue":"grafana-opentelemetry-java"}},{"key":"telemetry.distro.version","value":{"stringValue":"2.4.0-beta.1"}},{"key":"telemetry.sdk.language","value":{"stringValue":"java"}},{"key":"telemetry.sdk.name","value":{"stringValue":"opentelemetry"}},{"key":"telemetry.sdk.version","value":{"stringValue":"1.38.0"}}]},"scopeLogs":[{"scope":{"name":"com.mycompany.antifraud.FraudDetectionController","attributes":[]},"logRecords":[{"timeUnixNano":"1719915066488000000","observedTimeUnixNano":"1719915066488267425","severityNumber":13,"severityText":"WARN","body":{"stringValue":"checkOrder(totalPrice=300, shippingCountry=, customerIpAddress=127.0.0.1) fraudScore=15, status=REJECTED"},"attributes":[{"key":"thread.id","value":{"intValue":"44"}},{"key":"thread.name","value":{"stringValue":"http-nio-8080-exec-1"}}],"flags":1,"traceId":"336f93f9f72b9fec3e4e01e38cb6a99c","spanId":"de97c85b1ee0669a"}]}]}

This is from open-telemetry/opentelemetry-collector-contrib#33846

[trentm]

https://github.com/open-telemetry/opentelemetry-java/tree/main/exporters/logging-otlp/src/main/java/io/opentelemetry/exporter/logging/otlp