Multi-Source Data Pipeline with Automated Error Handling

Design a robust PHP data pipeline using Laravel that aggregates data from multiple REST APIs (Salesforce, Google Analytics, internal databases) with comprehensive error handling, logging, and automatic retry mechanisms. Implement circuit breaker patterns to prevent cascading failures, include detailed error tracking with Monolog, and create a self-healing mechanism that can automatically pause and resume data synchronization if critical errors occur. Provide a modular architecture that allows easy addition of new data sources and supports horizontal scaling.