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+
+"optout" ping (obsolete)
+========================
+
+This ping is generated when a user turns off FHR upload from the Preferences panel, changing the related ``datareporting.healthreport.uploadEnabled`` :doc:`preference <../internals/preferences>`.
+
+This ping contains no client id and no environment data.
+
+Structure:
+
+.. code-block:: js
+
+ {
+ version: 4,
+ type: "optout",
+ ... common ping data
+ payload: { }
+ }
+
+Expected behaviours
+-------------------
+The following is a list of expected behaviours for the ``optout`` ping:
+
+- Sending the "optout" ping is best-effort. Telemetry tries to send the ping once and discards it immediately if sending fails.
+- The ping might be delayed if ping sending is throttled (e.g. around midnight).
+- The ping can be lost if the browser is shutdown before the ping is sent out the "optout" ping is discarded.
+
+Version History
+---------------
+
+- Firefox 63:
+
+ - "optout" ping replaced the "deletion" ping (`bug 1445921 <https://bugzilla.mozilla.org/show_bug.cgi?id=1445921>`_).