Add OTLP protocol telemetry options

[loganrosen]

Summary

• Add a global OTLP HTTP protocol telemetry config option across Node.js, Python, Go, .NET, Java, and Rust SDKs.
• Map the option to OTEL_EXPORTER_OTLP_PROTOCOL when the SDK spawns the Copilot CLI.
• Document JSON/protobuf protocol selection and update focused mapping tests.

Testing

• just format
• cd java && mvn spotless:apply
• cd nodejs && npm test -- --run test/telemetry.test.ts test/e2e/client_options.e2e.test.ts -t "TelemetryConfig env var mapping|should propagate process options"
• cd nodejs && npm test -- --run test/e2e/client_options.e2e.test.ts -t "should propagate process options"
• cd python && uv run pytest test_telemetry.py e2e/test_client_options_e2e.py::TestClientOptions::test_should_propagate_process_options_to_spawned_cli e2e/test_telemetry_e2e.py::TestTelemetryConfig -q
• cd go && go test . && go test ./internal/e2e -run 'TestTelemetryConfigUnit|TestClientOptionsE2E/should_propagate_process_options_to_spawned_cli'
• cd dotnet && dotnet test test/GitHub.Copilot.SDK.Test.csproj --filter "FullyQualifiedName~GitHub.Copilot.Test.Unit.TelemetryTests|FullyQualifiedName~Should_Propagate_Process_Options_To_Spawned_Cli"
• cd rust && cargo test --features test-support --lib otlp_http_protocol_serde_matches_env_value && cargo test --features test-support --lib telemetry_config && cargo test --features test-support --lib build_command
• cd java && mvn verify

Note: full auth-dependent local E2E runs hit harness/auth isolation without GITHUB_ACTIONS=true, so validation focused on the affected telemetry mapping paths.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds support for configuring the OTLP/HTTP protocol used by the spawned CLI’s OpenTelemetry exporter via a new otlp_protocol / otlpProtocol option across SDKs and docs.

Changes:

• Introduce an OTLP protocol option in each SDK’s TelemetryConfig, and propagate it to OTEL_EXPORTER_OTLP_PROTOCOL when spawning the CLI.
• Update unit/E2E tests to cover the new env var mapping.
• Update READMEs and observability docs to document the new option and its allowed values.

Show a summary per file

File	Description
rust/src/lib.rs	Adds OtlpHttpProtocol enum and plumbs otlp_protocol into CLI env var injection + tests.
rust/README.md	Documents Rust usage of OtlpHttpProtocol and mentions the new env var.
python/copilot/client.py	Extends TelemetryConfig TypedDict and forwards OTEL_EXPORTER_OTLP_PROTOCOL on spawn.
python/test_telemetry.py	Updates unit test mapping for telemetry env vars to include protocol.
python/e2e/test_telemetry_e2e.py	Extends E2E coverage for default/unset and set telemetry protocol.
python/e2e/test_client_options_e2e.py	Ensures protocol is propagated to the spawned CLI in E2E.
python/README.md	Documents otlp_protocol option and allowed values.
nodejs/src/types.ts	Adds otlpProtocol to TS TelemetryConfig type.
nodejs/src/client.ts	Propagates otlpProtocol into OTEL_EXPORTER_OTLP_PROTOCOL for spawned CLI.
nodejs/test/telemetry.test.ts	Extends env var mapping tests to include OTLP protocol.
nodejs/test/e2e/client_options.e2e.test.ts	Validates protocol propagation in E2E capture.
nodejs/README.md	Documents otlpProtocol option and allowed values.
java/src/main/java/com/github/copilot/rpc/TelemetryConfig.java	Adds otlpProtocol field + getter/setter with Javadoc.
java/src/main/java/com/github/copilot/CliServerManager.java	Injects OTEL_EXPORTER_OTLP_PROTOCOL into ProcessBuilder env.
java/src/test/java/com/github/copilot/TelemetryConfigTest.java	Adds unit coverage for otlpProtocol getter/setter + fluent chaining.
java/src/test/java/com/github/copilot/CliServerManagerTest.java	Updates telemetry setup in tests to include protocol.
go/types.go	Adds OTLPProtocol field to Go TelemetryConfig.
go/client.go	Injects OTEL_EXPORTER_OTLP_PROTOCOL into the CLI process env.
go/internal/e2e/telemetry_e2e_test.go	Extends telemetry config tests for default/unset and set protocol.
go/internal/e2e/client_options_e2e_test.go	Ensures protocol is propagated in E2E env capture.
go/README.md	Documents OTLPProtocol option and allowed values.
dotnet/src/Types.cs	Adds OtlpProtocol property with XML docs.
dotnet/src/Client.cs	Injects OTEL_EXPORTER_OTLP_PROTOCOL into spawned CLI env.
dotnet/test/Unit/TelemetryTests.cs	Extends unit tests for default/unset and set protocol.
dotnet/test/E2E/ClientOptionsE2ETests.cs	Validates protocol propagation in E2E env capture.
dotnet/README.md	Documents OtlpProtocol option and allowed values.
docs/observability/opentelemetry.md	Adds protocol option to the cross-SDK table and explains expected values.
docs/getting-started.md	Adds protocol option to the getting-started telemetry table and guidance.

Copilot's findings

• Files reviewed: 28/28 changed files
• Comments generated: 4

[stephentoub]

Thanks