Monitoring Large Language Models (LLMs) is crucial for maintaining their performance, reliability, and safety in production environments. Inadequate monitoring can lead to significant financial losses and damage a company's reputation. Monitoring LLMs helps maintain system health, improves model outputs, and detects anomalies such as hallucinations and output biases. Regulatory bodies are tightening requirements on how AI systems handle personal data, making proactive detection and mitigation of ethical and security issues essential for compliance. Effective monitoring involves tracking specific metrics that reflect performance and resource usage at scale, addressing LLM evaluation challenges. It ensures the accuracy, consistency, and relevance of model responses, prevents harmful or biased content, detects performance degradation over time, and assists in evaluating Retrieval-Augmented Generation. Monitoring also aims to maintain low latency, optimize CPU and GPU usage, and reduce costs while maintaining performance. Implementing effective monitoring practices is essential for LLMs to operate in production, especially when scaling, and involves setting up a framework, integrating it with existing systems, automating alerts, and using the right tools and techniques.