Which MuleSoft product can be used for monitoring APIs?

Anypoint Monitoring is specifically designed for monitoring APIs and the applications that interact with them. It provides comprehensive insights into application performance, helps identify anomalies, and ensures that APIs are performing optimally. Through dashboards and detailed metrics, users can track the health and usage of their APIs, allowing for proactive management and troubleshooting.

The other choices, while related to the MuleSoft ecosystem, do not serve the primary function of monitoring APIs. For instance, API Manager is primarily used for managing the lifecycle of APIs, including creation, governance, and security. DataWeave is a data transformation language used to manipulate and integrate data but does not include monitoring capabilities. Runtime Fabric is a deployment solution that allows for the running of Mule applications in a variety of environments, focusing more on deployment rather than monitoring functionalities.