Businesses increasingly rely on LLM proxies to streamline the integration and governance of large language models, offering a centralized interface that simplifies model access and ensures compliance. However, these proxies introduce monitoring and visibility challenges, such as difficulties in tracing issues back to either the model or the proxy logic, and potential security vulnerabilities from mishandling sensitive data. Effective monitoring is crucial to avoid performance risks, such as blocking valid prompts or misrouting requests, which can degrade application performance. Tools like Datadog LLM Observability provide end-to-end visibility and trace-level insights, allowing teams to optimize model routing, control costs, and maintain performance by tracking model usage and identifying expensive behaviors. By doing so, teams can adjust routing rules to prioritize cost-effective models and set alerts to prevent unexpected overages, ensuring efficient and cost-effective LLM usage.