Status of MongoDB Servers
typedef struct _mongoc_topology_description_t mongoc_topology_description_t;
mongoc_topology_description_t is an opaque type representing the driver's knowledge of the MongoDB server or servers it is connected to.
Its API conforms to the SDAM Monitoring Specification.
Applications receive a temporary reference to a
mongoc_topology_description_t as a parameter to an SDAM Monitoring callback. See Introduction to Application Performance Monitoring.