gecko-dev/toolkit/components/telemetry/docs/index.rst

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Telemetry
=========
Telemetry is a feature that allows data collection. This is being used to collect performance metrics and other information about how Firefox performs in the wild.
Client-side, this consists of:
* data collection in `Histograms <https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Adding_a_new_Telemetry_probe>`_ and other data structures
* assembling :doc:`pings` with the general information and the data payload
* sending them to the server and local ping retention
*Note:* the `data collection policy <https://wiki.mozilla.org/Firefox/Data_Collection>`_ documents the process and requirements that are applied here.
.. toctree::
:maxdepth: 2
pings
common-ping
environment
main-ping
preferences