Your ecommerce application receives external requests and forwards them to third-party API services for credit card processing, shipping, and inventory management as shown in the diagram.

Your customers are reporting that your application is running slowly at unpredictable times. The application doesn’t report any metrics. You need to determine the cause of the inconsistent performance. What should you do?

A. Install the OpenTelemetry library for your respective language, and instrument your application. B. Install the Ops Agent inside your container and configure it to gather application metrics. C. Modify your application to read and forward the X-Cloud-Trace-Context header when it calls the downstream services. D. Enable Managed Service for Prometheus on the Google Kubernetes Engine cluster to gather application metrics.