over a single *output* frame; it is *not* a measurement over the last 100
output frames, even though the statistics are only printed every 100th.
+For more precise measurements, you can use Prometheus metrics to get percentiles
+for all of these points, which will measure over all frames (over a one-minute
+window). This yields more precise information than sampling every 100 frames,
+but setting up Prometheus and a graphic tool is a bit more work, and usually not
+worth it for simple measurement. For more information, see :doc:`monitoring`.
+
Another trick that can be useful in some situations is *looping* your signal,
ie., connecting your output back into your input. This allows you to measure
delays that don't happen within Nageru itself, like any external converters,
sure your A/V chain passes the signal through without quality degradation,
if you first set up a static picture as a signal and then switch to the loop
input to verify that the signal stays stable without color e.g. shifts [#]_.
-See the section on :ref:`the frame analyzer <analyzer>` for other ways of
+See the section on :doc:`the frame analyzer <analyzer>` for other ways of
debugging signal integrity.)
For this, the *timecode output* is useful; you can turn it on from the Video