A couple weeks ago I described how I was collecting client side HTTP metrics by using Clickhouse and Vector to record Network Event Log (“NEL”) data from browsers. NEL lets browsers (mostly Chrome and its derivatives today) tell web servers about problems and performance without requiring any client-side Javascript or anything else fancy or error-prone. So far, the data collected by this has been fascinating, and it’s pointed out several minor problems that I’ve been able to fix. Howe...
