Everything OPS Huawei Telefonica I+D Telefonica Swisscom Network platforms use Network Telemetry, such as YANG-Push (RFC 8641), to continuously stream information, including both counters and state information. This document describes the metadata that ensure that the collected data can be interpreted correctly. This document specifies the Data Manifest, composed of two YANG data models (the Platform Manifest and the non-normative Data Collection Manifest). These YANG modules are specified at the network level (e.g., network controllers) to provide a model that encompasses several network platforms. The Data Manifest must be streamed and stored along with the data, up to the collection and analytics systems to keep the collected data fully exploitable by the data scientists and relevant tools. Additionally, this document specifies an augmentation of the YANG-Push model to include the actual collection period, in case it differs from the configured collection period.