Fix Monitor Service IllegalStateException-created-by-agentic

[shaykeren]

Issue Description

The MonitorService is experiencing critical IllegalStateException failures in the monitor endpoint. The service throws unhandled exceptions due to improper state management and missing error handling mechanisms.

Impact

• Service reliability is compromised
• Monitor endpoint failures
• 25 occurrences between May 21st and May 31st, 2025

Root Cause

The service lacks:

• Proper state management
• Error handling mechanisms
• Circuit breaker pattern
• Health check integration

Solution

A fix has been implemented in PR #87 that includes:

1. Thread-safe state management using AtomicBoolean
2. Comprehensive error handling with custom exceptions
3. Circuit breaker pattern implementation
4. Spring Boot health check integration
5. Fixed isRunning() method implementation

Related Information

• Error Type: java.lang.IllegalStateException
• Error Message: "monitor failure"
• Affected Service: petclinic
• Affected Endpoint: monitor
• Error Score: 100 (Maximum severity)
• Trace ID: 879A7FFBDDC96EE10C5A274C8B8BBF1B

Next Steps

1. Review and merge PR Fix Monitor Service State Management and Error Handling-created-by-agentic #87
2. Monitor the service for any remaining issues
3. Consider adding more comprehensive monitoring