Media Viewer's usage of EventLogging grew considerably because of all the
tracking we're doing:
http://lists.wikimedia.org/pipermail/analytics/2014-May/002053.html and
Nuria asked us to reduce the rate.
Due to the global size we're dealing with, instead of logging every action
on every site, we'll now have to measure a sample and extrapolate an
estimate. As a quickfix last Friday Gergo introduced the sampling of
actions (one every thousand actions instead of each action is now
recorded). As a result all figures on the actions graph were divided by
1000 overnight, making the line appear to go to 0. If you actually hover
over recent days and look at the lest sidebar, you'll see that there are
figures (they are kind of useless, though, more on that below).
We're now working on improvements and fixing the graphs:
https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/619 The
general gist of it is that the figures will be compensated according to the
sampling and that the sampling factor will be fine-tuned to only apply to
metrics that were responsible for the high traffic.
Unfortunately it looks like the 1:1000 sampling since last Friday was too
extreme and is destructive of information, even for the actions that were
the most numerous. We knew that such a high sampling factor was going to
destroy information for small wikis or metrics with low figures, but even
the huge metrics in the millions have become unreliable. I'm saying that
because multiplying even the largest figures by 1000 still doesn't give an
estimate close to what it was before the change. Which means that the
actions graph probably won't be fixable for the period since last Friday
until my fixes make it through. Even compensating for the sampling (by
multiplying the figures by 1000), the line would jump up and down every day
for each metric.
Graphs other than actions are unaffected (they were already sampled). The
duration log was also affected, but that one doesn't have graphs yet, as
the task to create them has been given low priority in the cycle.
On Mon, May 19, 2014 at 8:43 PM, Fabrice Florin <fflorin(a)wikimedia.org>wrote;wrote:
Hi guys,
Does anyone know why the Media Viewer metrics dashboards seem to be stuck
with old data from Friday?
http://multimedia-metrics.wmflabs.org/dashboards/mmv
Is there anything we could fiddle with to get the new data to show up?
Thanks for any insights :)
Fabrice
_______________________________
Fabrice Florin
Product Manager
Wikimedia Foundation
http://en.wikipedia.org/wiki/User:Fabrice_Florin_(WMF)
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