Reviewer: Alexey Melnikov Review result: Ready Hi, I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. Network telemetry is a technology for gaining network insight and facilitating efficient and automated network management. This document defines network telemetry as an extension of Operations, Administration, and Management (OAM) techniques. This document clarifies the terminologies and classifies the modules and components of a network telemetry system from different perspectives, in particilar whether they operate at the control plane, the management plane or the forwarding plane. Examples of both IETF and non IETF technologies are given. The document is well written and has a good Security Considerations section. As this document is describing a framework, the security considerations stay generic, but the Security Considerations covers everything I can think of in regards to data confidentiality, privacy, access control, etc. Nits: JSON and XML should have informative references. Best Regards, Alexey