Gateways rename paths, strip headers, and collapse versions. If your only client signal lives on a header that disappears after the edge, your usage story will drift every release.
Prefer a small set of durable tags: application id, environment, and partnership tier. Keep them short, documented, and required for new clients before keys are issued.
For legacy callers, invent aliases rather than forcing a big-bang rename. Analytics that wait for perfect instrumentation never ship.
Review tags quarterly. Dead apps still calling under old names are a common source of “mystery” volume for teams in Thon Buri and across Bangkok.