code: private Invoker exceptionMetered(Invoker invoker, List<Method> meteredMethods) {
  
          ImmutableMap.Builder<String, InstrumentedInvokers.ExceptionMeter> meters =
                  new ImmutableMap.Builder<>();
  
          for (Method m : meteredMethods) {
  
              ExceptionMetered annotation = m.getAnnotation(ExceptionMetered.class);
              final String name = chooseName(
                      annotation.name(),
                      annotation.absolute(),
                      m,
                      ExceptionMetered.DEFAULT_NAME_SUFFIX);
              Meter meter = metricRegistry.meter(name);
              meters.put(m.getName(), new InstrumentedInvokers.ExceptionMeter(meter, annotation.cause()));
          }
  
          return new InstrumentedInvokers.ExceptionMeteredInvoker(invoker, meters.build());
      }
docs: Factory method for ExceptionMeteredInvoker.