Remove the observer having the specified observerName from the registry of observers maintained by this logger manager. Return 0 if the observer having observerName was successfully deregistered from this logger manager, and a non-zero value (with no effect) otherwise. Henceforth, the observer that had observerName will no longer receive log records published by this logger manager.
Declared in <ball_loggermanager.h>
int
deregisterObserver(std::string_view const& observerName);