The metrics-agent now collects kubernetes resources using informers. Previously the agent would make a request to the api-server for the entire list of each kubernetes resource, and now the agent instead stores the list of each resource in memory and updates dynamically as the cluster's resources change. This change reduces the size of the requests made to the api-server from the metrics-agent which helps api-server/cluster performance.
This metrics-agent release does increase memory usage of the agent and after upgrading to this version, customers should monitor their deployment to ensure the agent has healthy memory requests/limit configurations. See the "Computing Resources for Metrics Agent" section in the README for more information.