@class NSMutableArray, NSObject; @protocol OS_dispatch_queue; @interface OSADiagnosticMonitorClient : NSObject { NSObject<OS_dispatch_queue> *_queue; NSMutableArray *_observers; } @property (class, readonly, nonatomic) OSADiagnosticMonitorClient *sharedClient; - (id)init; - (void)removeObserver:(id)a0; - (void).cxx_destruct; - (void)addObserver:(id)a0 forTypes:(id)a1; - (id)q_shimWrappingObserver:(id)a0 creatingIfAbsent:(BOOL)a1 removingIfPresent:(BOOL)a2; @end