--------------------
Updated
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* Renamed "custom metric" to "custom attribute" throughout the repo. This was based on a `decision (ADR) captured in edx-django-utils`_.
* Deprecated RequestMetricsMiddleware due to rename. Use RequestCustomAttributesMiddleware instead.
.. _`decision (ADR) captured in edx-django-utils`: https://github.com/openedx/edx-django-utils/blob/master/edx_django_utils/monitoring/docs/decisions/0002-custom-monitoring-language.rst