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.. _telemetry_pings:
=====================
Telemetry pings
=====================
A *Telemetry ping* is the data that we send to Mozilla's Telemetry servers.
The top-level structure is defined by the :doc:`common ping format <../data/common-ping>`. This is a JSON object which contains:
* some basic information shared between different ping types
* the :doc:`environment data <../data/environment>` (optional)
* the data specific to the *ping type*, the *payload*.
Ping types
==========
We send Telemetry with different ping types. The :doc:`main <../data/main-ping>` ping is the ping that contains the bulk of the Telemetry measurements for Firefox. For more specific use-cases, we send other ping types.
Pings sent from code that ships with Firefox are listed in the :doc:`data documentation <../data/index>`.
Important examples are:
* :doc:`main <../data/main-ping>` - contains the information collected by Telemetry (Histograms, Scalars, ...)
* :doc:`saved-session <../data/main-ping>` - has the same format as a main ping, but it contains the *"classic"* Telemetry payload with measurements covering the whole browser session. This is only a separate type to make storage of saved-session easier server-side. As of Firefox 61 this is sent on Android only.
* :doc:`crash <../data/crash-ping>` - a ping that is captured and sent after a Firefox process crashes.
* :doc:`new-profile <../data/new-profile-ping>` - sent on the first run of a new profile.
* :doc:`update <../data/update-ping>` - sent right after an update is downloaded.
* :doc:`deletion-request <../data/deletion-request-ping>` - sent when FHR upload is disabled