typedef void (*mongoc_apm_topology_opening_cb_t) (

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025             MONGOC_APM_SET_TOPOLOGY_OPENING_CB(3)

       • callbacks: A mongoc_apm_callbacks_t.

       • cb:  A  function  to  call  with  a  mongoc_apm_topology_opening_t  whenever  the  driver initializes a
         mongoc_topology_description_t.

       SEEALSO:IntroductiontoApplicationPerformanceMonitoring

          typedef void (*mongoc_apm_topology_opening_cb_t) (
             const mongoc_apm_topology_opening_t *event);

          void
          mongoc_apm_set_topology_opening_cb (mongoc_apm_callbacks_t *callbacks,
                                              mongoc_apm_topology_opening_cb_t cb);

       Receive an event notification whenever the driver initializes a mongoc_topology_description_t.