const mongoc_topology_description_t *

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025MONGOC_APM_TOPOLOGY_CH...T_PREVIOUS_DESCRIPTION(3)

       • event: A mongoc_apm_topology_changed_t.

       A mongoc_topology_description_t that should not be modified or freed.

       SEEALSO:IntroductiontoApplicationPerformanceMonitoring

          const mongoc_topology_description_t *
          mongoc_apm_topology_changed_get_previous_description (
             const mongoc_apm_topology_changed_t *event);

       Returns  this  event's  previous  description.  The  data is only valid in the scope of the callback that
       receives this event; copy it if it will be accessed after the callback returns.