PROVIDING DIAGNOSTIC METRICS FOR VIRTUAL CONNECTIONS OVER PHYSICAL CONNECTIONS INTO A PROVIDER NETWORK

A provider network may collect diagnostic metrics for virtual connections implemented over physical connections to resources in the provider network. Diagnostic metric collection may be enabled via an interface for the provider network. In response to receiving a request to enable diagnostic metric collection for a particular virtual connection, a diagnostic agent within the provider network may begin sending diagnostic request messages to a client-side endpoint via the particular virtual connection. Responses to the request messages may be received back at the diagnostic agent. The diagnostic responses may then be used to generate diagnostic metrics for the particular virtual connection, which may be provided through the provider network interface.