=== Documentation ===
* [ https://gecko.readthedocs.org/en/latest/toolkit/components/telemetry/telemetry/index.html Client pings (tree documentation)]
* [https://docs.google.com/spreadsheets/d/1bqamxVskDF7kQ6xL7S2BqY8TpngL-w41v6keiX_qByg/edit?usp=sharing V2 - V4 mappings]