[Feat] Implement metrics enhancements and testing scripts for issue #699

[vk-playground]

Issue #699 - Metrics Enhancements

Overview

This document outlines the changes made to address a subset of the requirements in issue #699, which involved enhancing the metrics functionality in MCP Gateway, and provides instructions for testing these enhancements.

Changes Implemented

1. Enhanced Metrics Calculation Functions

Updated the following functions in mcpgateway/utils/metrics_common.py:

• calculate_success_rate(): Improved to handle edge cases such as:

  • Division by zero (when total is 0)
  • None inputs
  • Type conversion errors

• format_response_time(): Enhanced to format response times with:

  • Consistent 3 decimal places (x.xxx)
  • Proper handling of None values
  • Consistent display of trailing zeros

2. Admin API Enhancements

Modified mcpgateway/admin.py to:

• Export ALL rows in metrics CSV exports (previously limited to top 5)
• Format response times consistently with 3 decimal places
• Properly handle empty states (display "N/A" when no data exists)

3. Services Improvements

Updated metrics retrieval in service modules to support:

• Optional limit parameter to retrieve any number of results
• Unlimited results when exporting metrics data

How to Test

Follow these steps to verify the metrics enhancements:

Prerequisites

1. Create and activate a Python virtual environment
2. Install dependencies: pip install -e .

Testing Core Metrics Functions

1. Run the unit tests for the metrics functions:

   python -m pytest tests/test_metrics_functions.py -v
   

   This will verify:

   • Success rate calculation handles edge cases (0/0, None inputs)
   • Response time formatting is consistent with 3 decimal places
   • Empty states are handled correctly

Testing with Manual Data

1. Start the MCP Gateway server with admin features enabled:

   $env:MCPGATEWAY_ADMIN_API_ENABLED="true"
   $env:MCPGATEWAY_UI_ENABLED="true"
   python -m uvicorn mcpgateway.main:app --host 0.0.0.0 --port 8008 --reload
   

2. Create test data using the provided script:

   python tests/setup_test_data.py
   

   This creates test tools with different metrics patterns:

   • Tool 1: 80% success rate (8 successes, 2 failures)
   • Tool 2: 100% success rate (5 successes, 0 failures)
   • Tool 3: 0% success rate (0 successes, 3 failures)

3. Test the admin UI:

   • Access http://localhost:8008/admin (username: admin, password: changeme)
   • Navigate to the Metrics tab
   • Verify all test tools appear with correct success rates
   • Verify response times are shown with 3 decimal places

4. Test CSV export:

   • Click "Export Metrics" in the admin UI
   • Verify ALL rows are included (not just top 5)
   • Verify response times have 3 decimal places
   • Or directly access: http://localhost:8008/admin/metrics/export?entity_type=tools

5. Test empty state:
   • Using SQLite, delete all metrics for one tool
   • Verify the UI and export handle empty state by showing "N/A"

Verification Criteria

The issue is considered resolved when:

1. ✅ Success rate calculation handles all edge cases
2. ✅ Response times are consistently formatted with 3 decimal places
3. ✅ CSV exports include ALL rows, not just top 5
4. ✅ Empty states are handled gracefully with "N/A"

Additional Notes

• The metrics calculations happen in the metrics_common.py utility file
• The admin API handles converting None values to "N/A" for display
• The CSV export uses the same formatting logic as the UI display

Test Files Location

• Core tests: tests/test_metrics_functions.py
• Test data generation: tests/test_setup_data.py

Troubleshooting

If the server fails to start with database errors:

1. Check for unique constraint errors in the database
2. Update the test data generation script to use unique tool names
3. Try clearing the existing database or using a new one

Newly added on Sep 9:

Prompt Usage Metrics

• Status: Added comprehensive metrics recording
• Location: mcpgateway/services/prompt_service.py
• Changes Made:
  • Added _record_prompt_metric() method
  • Modified get_prompt() method to record metrics with try-except-finally structure
  • Imports time module for response time calculation
  • Records success/failure, response time, and error messages

Server Interaction Metrics

• Status: Added comprehensive server interaction metrics recording
• Location: mcpgateway/federation/forward.py
• Changes Made:
  • Added ServerMetric import
  • Added time module import
  • Added _record_server_metric() method to ForwardingService class
  • Modified _forward_to_gateway() method to:
    • Track start time using time.monotonic()
    • Record success/failure status
    • Record error messages
    • Always record metrics in finally block
    • Calculate response time accurately

🧪 TESTING RESULTS

Automated Test Results

UPDATED METRICS FUNCTIONALITY TEST
============================================================
Database Setup: ✓ PASS
Service Imports: ✓ PASS
ORM Properties: ✓ PASS  
UI Time Formatting: ✓ PASS
Metrics Infrastructure: ✓ PASS

Overall: 5/5 tests passed

🎉 All tests passed! The metrics functionality has been improved:
   • Tool execution metrics: ✓ Working
   • Prompt usage metrics: ✓ Added
   • Resource read metrics: ✓ Added
   • UI time formatting: ✓ Working
   • Counter incrementation: ✓ Working
   • Timestamp updates: ✓ Working

Database Status

• tool_metrics: 72 records ✅
• prompt_metrics: 30 records ✅
• resource_metrics: 24 records ✅
• server_metrics: 52 records ✅

---

🚀 TECHNICAL IMPLEMENTATION DETAILS

1. Prompt Metrics Recording

# Added to mcpgateway/services/prompt_service.py
async def _record_prompt_metric(self, db: Session, prompt: DbPrompt, start_time: float, success: bool, error_message: Optional[str]) -> None:
    end_time = time.monotonic()
    response_time = end_time - start_time
    metric = PromptMetric(
        prompt_id=prompt.id,
        response_time=response_time,
        is_success=success,
        error_message=error_message,
    )
    db.add(metric)
    db.commit()

2. Server Interaction Metrics Recording

# Added to mcpgateway/federation/forward.py
async def _record_server_metric(self, db: Session, gateway: DbGateway, start_time: float, success: bool, error_message: Optional[str]) -> None:
    end_time = time.monotonic()
    response_time = end_time - start_time
    metric = ServerMetric(
        server_id=gateway.id,
        response_time=response_time,
        is_success=success,
        error_message=error_message,
    )
    db.add(metric)
    db.commit()

3. Integration Points

• Tool metrics: Recorded in tool execution methods ✅
• Prompt metrics: Recorded in get_prompt() method ✅
• Resource metrics: Recorded in read_resource() method ✅
• Server metrics: Recorded in _forward_to_gateway() method ✅

---

📋 MANUAL TESTING INSTRUCTIONS

Prerequisites

cd mcp-context-forge
$env:MCPGATEWAY_ADMIN_API_ENABLED="true"
$env:MCPGATEWAY_UI_ENABLED="true"
python -m uvicorn mcpgateway.main:app --host 0.0.0.0 --port 8008

Testing Steps

1. Access Admin UI: http://localhost:8008/admin (admin/changeme)
2. Test Tool Metrics: Use tools → verify counter increment & time update
3. Test Prompt Metrics: Use prompts → verify counter increment & time update (NEW)
4. Test Resource Metrics: Access resources → verify counter increment & time update (NEW)
5. Test Server Metrics: Trigger server interactions → verify counter increment & time update (NEW)
6. Verify UI Time Formatting: All timestamps show relative time formatting

Screen Recording 2025-09-09 at 12.16.58 AM

🔍 SUCCESS CRITERIA STATUS UPDATE

✅ IMPLEMENTED (Code Level)

• Tool executions: Code to increment execution counters ✅
• Resource reads: Code to increment execution counters ✅
• Prompt uses: Code to increment execution counters ✅
• Server interactions: Code to increment execution counters ✅
• Update lastExecution/lastUsed timestamps: All entity types ✅
• UI shows correct relative time: "3 minutes ago" format ✅
• Core functionality preserved: No breaking changes ✅

TESTING STATUS

• Code Implementation: ✅ COMPLETE - All metrics recording functions implemented
• Database Schema: ✅ COMPLETE - All metrics tables exist and working
  =

📊 TEST DATA SOLUTION

RESOLVED: Created comprehensive test data in database:

✅ TEST TOOLS ADDED:
  • test-metrics-calculator (Test Metrics Calculator) - ✅ Enabled
  • test-metrics-search (Test Metrics Search) - ✅ Enabled  
  • test-metrics-tool-1 (Test Metrics Tool 1) - ✅ Enabled

✅ TEST PROMPTS ADDED:
  • test-metrics-prompt-1 - Test prompt for metrics verification
  • test-metrics-prompt-2 - Test summarization prompt for metrics

✅ TEST RESOURCES ADDED:
  • test-metrics-resource-1 - Test JSON data resource for metrics
  • test-metrics-resource-2 - Test YAML config resource for metrics

---

🎯 CURRENT STATUS

CODE IMPLEMENTATION: COMPLETE ✅

All metrics recording functionality has been successfully implemented across all entity types.

FUNCTIONAL TESTING: READY ✅

Test data has been added to database to enable proper testing of metrics functionality.

REQUIREMENTS VERIFICATION

Ready for Testing: The functionality can now be properly tested with:

1. Database-registered test tools that will properly record metrics
2. Admin UI access at http://localhost:8008/admin (admin/changeme)
3. Tool testing that will increment counters and update timestamps
4. Real-time verification of metrics updates

NEXT STEPS FOR COMPLETE VERIFICATION

1. Fix the first-row summary above the table

[crivetimihai]

Please rebase and retest

[vk-playground]

created a new PR here: #992