You support an application running on App Engine. The application is used globally and accessed from various device types. You want to know the number of connections. You are using Stackdriver Monitoring for App Engine. What metric should you use?
A. flex/connections/current
B. tcp_ssl_proxy/new_connections
C. tcp_ssl_proxy/open_connections
D. flex/instance/connections/current
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C. tcp_ssl_proxy/open_connections is a metric that measures the number of open connections to your App Engine application through the TCP SSL proxy. This metric reflects the number of connections from various device types and locations to your application. You can use this metric to monitor the load and performance of your application.
A