You can now measure the amount of time from content ingestion to playback on the client using the Mux Data SDK. The Live Stream Latency metric reports on the average stream latency experienced by each viewer. The metric is also available for historical reporting. Latency can be aggregated by country, type of stream, video title, as well as the other dimensions available in the Mux Data Metrics reporting. To collect this data, you'll need to use Mux Data with your HLS live streams, insert EXT-X-PROGAM-DATE-TIME tags in your manifests, and have an up-to-date SDK release. You can learn more in the Blog Post.