code: @Trivial
      private void stateClosed() {
          rollingWindow.clear();
          state.set(State.CLOSED);
          metricRecorder.reportCircuitClosed();
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "Transitioned to Closed state");
          }
      }
docs: Transition to closed state