feat: switch the otel server for unit test integration

[chenhuansome]

What problem does this PR solve?

1. Switched the OTel server: Replaced the Jaeger exporter with an OTLP gRPC exporter, connecting to the local ts-trace service
2. Enhanced trace integration tests: Added a complete trace data verification mechanism
3. Added fault tolerance tests: Introduced trace system failure tolerance tests
4. Improved test workflow: Integrated ts-trace service startup into the CI workflow

Core Design

1. Interceptor pattern: Automatically adds tracing logic before and after client operations via OtelInterceptor
2. Asynchronous batch processing: Uses BatchSpanProcessor to improve performance and minimize impact on the main flow
3. Resource cleanup: Automatically cleans up trace data before and after each test case to ensure test isolation

Key Implementation

// Trace verification mechanism
private void checkLastTraceCommand(String command) {
    String queryTraceCommand = "SELECT command FROM \"%s\"".formatted(measurementName);
    // Query and verify trace data
}

// Fault tolerance design
private Tracer getErrTracer() {
    // Use an incorrect endpoint to test failure tolerance
    .setEndpoint("http://127.0.0.1:38086")
}

Test Coverage

• Basic query operation tracing: Validates tracing for commands like SHOW DATABASES
• Write operation tracing: Validates tracing for Line Protocol writes
• Integration tests: Complete tracing for database creation, write, and query workflows
• Fault tolerance tests: Client behavior when the OTel service is unavailable

CI Configuration Update
Automatically starts the ts-trace service before unit tests

- name: setup ts-trace
  run: go install github.com/openGemini/observability/trace/cmd/ts-trace@latest && ts-trace &

Achieved Results

• [✓ ] Achieved seamless integration of OpenTelemetry with the OpenGemini client

• [✓ ] Provided end-to-end trace data verification capability

• [✓ ] Ensured the client can still function normally when the OTel service is unavailable

• [✓ ] Improved unit test coverage and reliability

*related documents:
openGemini/openGemini.github.io#163

[dosubot]

Documentation Updates

Checked 2 published document(s). No updates required.

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