Gemini Telemetry Implementation - Complete

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🎉 Implementation Status: COMPLETE ✅

The Gemini library now includes comprehensive telemetry instrumentation that emits events for all API operations, enabling automatic observability and integration with Foundation's telemetry system.

📊 Implementation Summary

✅ Added Dependencies

  • Added :telemetry, "~> 1.2" to mix.exs

✅ Telemetry Events Implemented

Request Events

  • [:gemini, :request, :start] - Emitted when an API request begins
  • [:gemini, :request, :stop] - Emitted when an API request completes successfully
  • [:gemini, :request, :exception] - Emitted when an API request fails

Streaming Events

  • [:gemini, :stream, :start] - Emitted when a streaming request begins
  • [:gemini, :stream, :chunk] - Emitted when a streaming chunk is received
  • [:gemini, :stream, :stop] - Emitted when a streaming request completes
  • [:gemini, :stream, :exception] - Emitted when a streaming request fails

✅ Files Modified/Created

New Files

  • lib/gemini/telemetry.ex - Core telemetry helper module
  • test/gemini/telemetry_test.exs - Comprehensive test suite
  • telemetry_demo.exs - Demonstration script
  • simple_telemetry_test.exs - Simple test script
  • TELEMETRY_IMPLEMENTATION.md - This documentation

Modified Files

  • mix.exs - Added telemetry dependency
  • lib/gemini/config.ex - Added telemetry configuration support
  • lib/gemini/client/http.ex - Instrumented HTTP requests
  • lib/gemini/client/http_streaming.ex - Instrumented streaming requests
  • lib/gemini/generate.ex - Enhanced with telemetry metadata

✅ Key Features Implemented

1. Configurable Telemetry

# Enable/disable telemetry (default: enabled)
config :gemini_ex, telemetry_enabled: true

# Check status
Gemini.Config.telemetry_enabled?()

2. Rich Metadata

Every telemetry event includes:

  • url - API endpoint URL
  • method - HTTP method (:post, :get, etc.)
  • model - Gemini model being used
  • function - High-level function (:generate_content, :stream_generate, etc.)
  • contents_type - Content type (:text, :multimodal, :unknown)
  • stream_id - Unique ID for streaming requests
  • system_time - System timestamp

3. Performance Measurements

  • duration - Request duration in milliseconds
  • status - HTTP status code
  • chunk_size - Size of streaming chunks in bytes
  • total_chunks - Total chunks in streaming requests
  • total_duration - Total streaming duration

4. Error Tracking

  • reason - Exception or error details for failed requests

5. Content Classification

  • Automatically classifies content as :text, :multimodal, or :unknown
  • Enables content-type specific analytics

🧪 Testing

Unit Tests

# Run telemetry-specific tests
mix test test/gemini/telemetry_test.exs

# All tests pass
mix test

Live API Testing

# Set up authentication
export GEMINI_API_KEY="your-api-key"

# Run live tests with telemetry events
mix test test/live_api_test.exs --include live_api

Interactive Testing

# Start IEx session
iex -S mix

# Test configuration
Gemini.Config.telemetry_enabled?()
# => true

# Test helper functions
Gemini.Telemetry.generate_stream_id()
# => "a1b2c3d4e5f6g7h8"

Gemini.Telemetry.classify_contents("Hello world")
# => :text

# Attach telemetry handler to see events
:telemetry.attach("demo", [:gemini, :request, :start], fn event, measurements, metadata, _ ->
  IO.inspect({event, measurements, metadata})
end, nil)

# Make API call (with valid key) to see telemetry events
Gemini.generate("Hello world")

🔗 Foundation Integration

With this implementation, the Foundation library's Foundation.Integrations.GeminiAdapter can now automatically capture all Gemini telemetry events:

Expected Telemetry Flow

  1. Gemini Library → Emits telemetry events
  2. Foundation Adapter → Captures events automatically
  3. Foundation Events → Stores in event system
  4. Monitoring/Analytics → Process stored events

Example Event Output

# Foundation will capture events like:
[
  %Foundation.Event{
    type: :gemini_request_start, 
    data: %{
      model: "gemini-2.0-flash-lite", 
      function: :generate_content,
      contents_type: :text,
      url: "https://generativelanguage.googleapis.com/...",
      system_time: 1704067200000
    }
  },
  %Foundation.Event{
    type: :gemini_request_stop,
    data: %{
      duration: 1250,
      status: 200,
      model: "gemini-2.0-flash-lite"
    }
  }
]

📈 Benefits Achieved

1. Automatic Observability

  • Zero-configuration telemetry for all API calls
  • Request duration and performance tracking
  • Error tracking and debugging support

2. Streaming Analytics

  • Real-time chunk-level metrics
  • Stream completion tracking
  • Streaming performance analysis

3. Content-Type Analytics

  • Automatic classification of text vs multimodal content
  • Usage pattern analysis
  • Content-specific performance metrics

4. Foundation Integration

  • Seamless integration with Foundation's event system
  • Automatic event storage and processing
  • No additional configuration required

5. Developer Experience

  • Rich debugging information
  • Performance bottleneck identification
  • Production monitoring capabilities

🎯 Usage Examples

Basic Request Telemetry

# This call now emits telemetry events automatically
{:ok, response} = Gemini.generate("Explain quantum physics")

# Events emitted:
# 1. [:gemini, :request, :start] - with metadata
# 2. [:gemini, :request, :stop] - with duration and status

Streaming Telemetry

# Streaming calls emit additional events
Gemini.stream_generate("Write a story") do |chunk|
  # Events emitted for each chunk:
  # [:gemini, :stream, :chunk] - with chunk size
end

# Final event:
# [:gemini, :stream, :stop] - with total duration and chunk count

Error Telemetry

# Failed requests emit exception events
{:error, reason} = Gemini.generate("test", model: "invalid-model")

# Event emitted:
# [:gemini, :request, :exception] - with error details

🔧 Configuration Options

Enable/Disable Telemetry

# In config/config.exs
config :gemini_ex, telemetry_enabled: true  # default

# Or at runtime
Application.put_env(:gemini_ex, :telemetry_enabled, false)

Custom Telemetry Handlers

# Attach custom handlers for specific events
:telemetry.attach("my-handler", [:gemini, :request, :stop], fn _event, measurements, metadata, _config ->
  Logger.info("Request completed in #{measurements.duration}ms to #{metadata.model}")
end, nil)

✅ Verification Checklist

  • [x] Dependencies: Telemetry dependency added to mix.exs
  • [x] Configuration: Telemetry enable/disable support
  • [x] HTTP Client: Request telemetry instrumentation
  • [x] Streaming Client: Streaming telemetry instrumentation
  • [x] Generate Module: High-level API telemetry integration
  • [x] Helper Module: Comprehensive telemetry utilities
  • [x] Content Classification: Automatic text/multimodal detection
  • [x] Error Handling: Exception telemetry support
  • [x] Metadata: Rich context in all events
  • [x] Measurements: Performance metrics collection
  • [x] Tests: Comprehensive test coverage
  • [x] Documentation: Complete implementation docs
  • [x] Compilation: No errors or warnings
  • [x] Test Suite: All existing tests still pass

🚀 Ready for Foundation Integration

The Gemini library is now fully instrumented with telemetry and ready for integration with Foundation's Foundation.Integrations.GeminiAdapter. The adapter should automatically detect and capture all telemetry events without any additional configuration.

Next Steps for Foundation Integration:

  1. Deploy this version of gemini_ex
  2. Verify Foundation adapter detects telemetry events
  3. Test event storage in Foundation.Events
  4. Monitor telemetry in production

Implementation Complete ✅
All Requirements Met ✅
Ready for Production ✅