private Map<String, Object> buffers() {
Map<String, Object> buffers = Maps.newHashMap();
Map<String, Object> input = Maps.newHashMap();
BufferWatermark pWm = new BufferWatermark(
configuration.getRingSize(),
processBufferWatermark
);
input.put("utilization_percent", pWm.getUtilizationPercentage());
input.put("utilization", pWm.getUtilization());
buffers.put("input", input);
return buffers;
}