Add AFT-4.1 README: AFT MPLS Label Entry Counters

[mithunaditya-gnt]

Adds the test plan specification (README.md), metadata.textproto, and testregistry.textproto entry for AFT-4.1: AFT MPLS Label Entry Counters under feature/afts/mpls/otg_tests/afts_mpls_label_counters_test/.

Summary of Coverage

• AFT-4.1.1: Static MPLS LSP Pop-and-Forward (Direct Next-Hop Forwarding) label entry telemetry counters (packets-forwarded, octets-forwarded).
• AFT-4.1.2: Static MPLS LSP Pop-and-Lookup (Network-Instance FIB Lookup) label entry telemetry counters (packets-forwarded, octets-forwarded).
• Includes Canonical OC JSON coverage blocks and OpenConfig telemetry path definitions validated against validate_readme_canonicalocspec, validate_readme_ocpaths, addrundata, and sync_test_registry.

cc @paramasivamn1

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the test plan specification for verifying OpenConfig AFT MPLS label-entry telemetry counters. It covers the validation of packets-forwarded and octets-forwarded counters under two distinct MPLS forwarding modes: direct next-hop forwarding and network-instance FIB lookup. The changes provide the necessary documentation and registry entries to support future implementation and automated testing of these telemetry paths.

Highlights

• Test Plan Documentation: Added a comprehensive README.md for AFT-4.1: AFT MPLS Label Entry Counters, detailing test procedures for both Pop-and-Forward and Pop-and-Lookup scenarios.
• Metadata and Registry Updates: Included the necessary metadata.textproto and registered the new test plan in testregistry.textproto to ensure integration with the test suite.

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[OpenConfigBot]

Pull Request Functional Test Report for #6122 / 3bede46

Virtual Devices

Device	Test	Status	Test Documentation	Job	Raw Log
Arista cEOS		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Cisco 8000E		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Cisco XRd		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Juniper ncPTX		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Nokia SR Linux		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Openconfig Lemming		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters

Hardware Devices

Device	Test	Status	Test Documentation	Raw Log
Arista		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Cisco		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Juniper		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters
Nokia		AFT-4.1: pending authorization	AFT-4.1: AFT MPLS Label Entry Counters

Help

[gemini-code-assist]

Code Review

This pull request introduces a new test plan, AFT-4.1: AFT MPLS Label Entry Counters, along with its metadata and registry entries. The test plan details the verification of OpenConfig AFT MPLS label-entry telemetry counters (packets-forwarded and octets-forwarded) during MPLS-in-UDP (MPLSoGUE) decapsulation and forwarding across two modes: static MPLS LSP pop-and-forward and static MPLS LSP pop-and-lookup. There are no review comments, and the changes conform to the repository style guidelines; therefore, no additional feedback is provided.