Leaf-level resource configuration support for data export in telemetry

You can configure leaf-level resource paths for telemetry data export on network devices, reducing computational overhead and bandwidth usage. This feature supports selective querying of specific data elements,such as interface operational status or packet counters. The feature removes the need of exporting data for all instances of a resource. By focusing on relevant leaf devices, you obtain precise information efficiently, enhancing performance of telemetry collectors. Use the following XPath-based resource filters to further refine data queries for sensors using advanced forwarding technologies to stream Packet Forwarding Engine performance data: 

• Precise leaf such as /interfaces/interface[name='et-1/0/35']/state/counters/in-pkts
• Container within the path such as /interfaces/interface[name='et-1/0/35']/state/counters/
• List within the path /interfaces/interface/
• Exported leafs for IFD/IFL/Queues

Note that leaf-level support is applicable to both the RPC developed by Google (gRPC) and gRPC Network Management Interface (gNMI) transport modes. Leaf level subscription is not supported for leaf devices where configuration and exported paths are different.