Instrument Gemini streaming (streamGenerateContent) calls#55
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Abhijeet Prasad (AbhiPrasad) merged 4 commits intomainfrom Apr 16, 2026
Merged
Instrument Gemini streaming (streamGenerateContent) calls#55Abhijeet Prasad (AbhiPrasad) merged 4 commits intomainfrom
Abhijeet Prasad (AbhiPrasad) merged 4 commits intomainfrom
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The genai integration was not tracing streaming API calls at all. The URL router could not match streamGenerateContent endpoints, and the response parser only handled single-JSON responses. This adds full streaming support: SSE chunk parsing, response aggregation, time_to_first_token metrics, and proper URL routing for both streaming and non-streaming Gemini endpoints. Also adds time_to_first_token to non-streaming responses. Fixes #50 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Shows that both non-streaming and streaming Gemini calls now produce complete spans with output, token metrics, and time_to_first_token. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Require a delimiter (: or /) before the method name in containsGenerateContent to avoid potential false positives on hypothetical endpoints like deleteGenerateContentCache. Also document the single-candidate limitation in postprocessStreamingResults.
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Summary
streamGenerateContentendpoints (previously onlygenerateContentwas matched)time_to_first_tokenmetric for both streaming and non-streaming responsesgemini-2.0-flash(replacing deprecatedgemini-2.0-flash-exp) and fix missingotel.SetTracerProvidercallFixes #50
Test plan
TestContainsGenerateContent— verifies URL routing matches both streaming and non-streaming pathsTestExtractModelFromPath— verifies model extraction from streaming pathsTestIsStreamingPath— verifies streaming endpoint detectionTestStreamingGenerateContent— full integration test with VCR cassette verifying span creation, metadata, output aggregation, token metrics, andtime_to_first_tokentime_to_first_tokenassertion toTestBasicGenerateContentfor non-streamingmake cipasses (lint + test + build)🤖 Generated with Claude Code