feat: Enhance debug telemetry to return all traces with matching sessionID instead of single span

[pawel-maciejczek]

This PR

• returns all traces with a sessionID instead of a single span
• refactors the signals storage to stop using test otel packages
• refactors the signals storage for efficient retrieval without iterating over all spans on each get request

[gemini-code-assist]

Summary of Changes

Hello @pawel-maciejczek, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the debug telemetry service by centralizing the storage and retrieval of OpenTelemetry spans and logs. The primary goal is to provide a more complete and accurate view of telemetry data by ensuring that when a session ID is queried, all related spans within the entire trace are returned. This change improves the diagnostic capabilities by offering a holistic perspective of operations tied to a specific user session.

Highlights

• Unified Telemetry Storage: Refactored the DebugTelemetry service to use a single signalsHolder struct for managing both OpenTelemetry spans and logs, replacing separate in-memory exporters.
• Enhanced Session-Based Trace Retrieval: Modified GetSpansBySessionID to return all spans associated with a given session ID, including all spans within the same trace, rather than just individual spans directly tagged with the session ID.
• Improved Data Indexing: Introduced internal indexing within signalsHolder to efficiently map session IDs to trace IDs, and trace IDs to their respective spans, facilitating comprehensive trace retrieval.
• Test Coverage Expansion: Added new test cases to thoroughly validate the new functionality, ensuring that all relevant spans are correctly retrieved when querying by session ID, even across complex trace structures.

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Changelog

• server/adkrest/internal/services/debugtelemetry.go
  • Refactored DebugTelemetry to use a new signalsHolder for managing spans and logs.
  • Removed direct usage of tracetest.InMemoryExporter and InMemoryLogExporter.
  • Implemented sortAndConvertSignals to order and transform collected signals into DebugSpan objects.
  • Added new types signalHolder, inMemorySpan, and signalsHolder to encapsulate telemetry data and indexing logic.
  • Updated SpanProcessor and LogProcessor methods to integrate with the new signalsHolder.
  • Introduced ExportSpans and updateSpanIndexes methods within signalsHolder to build comprehensive trace and session mappings.
• server/adkrest/internal/services/debugtelemetry_test.go
  • Updated an existing test case to reflect the new behavior of GetSpansBySessionID.
  • Added new test cases, single_trace_all_returned and multi_trace_same_session, to verify the comprehensive retrieval of spans based on session ID across different trace scenarios.

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[gemini-code-assist]

Code Review

This pull request refactors the debug telemetry service to allow retrieving all spans within a trace for a given session ID, a significant enhancement from returning just a single span. The implementation introduces a new signalsHolder to unify span and log processing. My review focuses on a potential panic due to unsafe sorting, a data precision issue with timestamps, and a minor code clarity improvement in the tests. Overall, the changes are well-structured and the new functionality is well-tested.