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Add documentation about data collectors late collect #13844

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Add documentation about data collectors late collect #13844

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4 changes: 4 additions & 0 deletions profiler/data_collector.rst
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Expand Up @@ -79,6 +79,10 @@ request::
:doc:`/testing/profiling`) so it's recommended to return a string which is
short, lowercase and without white spaces.

Note that the data collect is triggered belatedly during the :ref:`kernel.response <component-http-kernel-kernel-response>` event. If you need to collect data that is only available
later, you should implement :class:`Symfony\\Component\\HttpKernel\\DataCollector\\LateDataCollectorInterface` and its :method:`Symfony\\Component\\HttpKernel\\DataCollector\\LateDataCollectorInterface::lateCollect` method which is invoked just before
the profiler data serialization (during :ref:`kernel.terminate <component-http-kernel-kernel-terminate>` phase).

.. _data_collector_tag:

Enabling Custom Data Collectors
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