feat(monitoring): implement health checks and resilience features (#253)

[sharad-mishra]

Health Monitoring and Resilience Features

Overview

Added monitoring and resilience capabilities to improve Protocol Server's reliability when interacting with multiple BPPs. These changes address the performance and stability requirements outlined in #253.

Key Changes

Performance Monitoring

• Added /health endpoint for system health checks
• Implemented service connection monitoring (Redis, MongoDB, RabbitMQ)
• Added response time tracking for BPP interactions

Reliability Improvements

• Added exponential backoff for failed requests
• Implemented configurable retry mechanism
• Enhanced error reporting with detailed context
• Added connection health validation

Error Handling

• Improved error formatting and context
• Added structured error responses
• Enhanced debugging information for failures
• Added connection status validation

Implementation Details

• Added health check methods to core services
• Enhanced Redis client with connection monitoring
• Improved gateway connection validation
• Added request timeout handling

Testing

Test the changes by:

1. Monitoring system health via /health endpoint
2. Validating retry behavior with network failures
3. Checking improved error responses
4. Testing with multiple BPP connections

Related Issues

• Closes Test with Multiple BPP #253 (Test with Multiple BPP)
• Parent Issue Protocol Server Latency Optimization - Code changes #248 (Protocol Server Latency Optimization)

Next Steps

• Add performance metrics collection
• Implement automated testing suite
• Add load testing scenarios