Network Analyzer uses your project's
Network Management Service Agent role
(roles/networkmanagement.serviceAgent) to read certain network
configurations that are used for discovering
GKE on-premises to control plane connectivity insights.
If you do not enable the Network Management API for your project, Network Analyzer is not able to discover these insights for that project. If you have not enabled the Network Management API, a message in the Network Analyzer console prompts you to enable this API to see these insights.