mongoc_apm_server_changed_get_previous_description()

const mongoc_server_description_t *
mongoc_apm_server_changed_get_previous_description (const mongoc_apm_server_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.

A mongoc_server_description_t that should not be modified or freed.

Introduction to Application Performance Monitoring