That instance has worked only for few weeks after it was setup. It's been broken for many many months, I've been tracking that piece of statistic manually with the query at [[mw:Gerrit/Navigation#Commits_lists]]. To have the same stats over time that the site had, we need to get CR on the gerrit reports database so that we can filters -1/-2'd changesets: [[mw:Talk:Gerrit/Navigation]].
Limn stuff is too unstable anyway.

I would suggest to turn this service off as we know have outsourced this work to Bitergia.

(In reply to comment #2)

I would suggest to turn this service off as we know have outsourced this work
to Bitergia.

I liked the graphs over time. Will Bitergia have something similar that's regularly updated?

I agree on concentrating all efforts on tech metrics at http://korma.wmflabs.org

What we have now is

Source code metrics
http://korma.wmflabs.org/browser/scm.html

Code review metrics
http://korma.wmflabs.org/browser/scr.html

I don't recall the exact metrics displayed in gerrit-stats, but if you are missing anything specifically please file an enhancement request. The current plan is to implement five key performance indicators, as specified at https://www.mediawiki.org/wiki/Community_metrics#Key_performance_indicators

We have Gerrit stats updated regularly:

Under Focused Analysis

http://korma.wmflabs.org/browser/gerrit_review_queue.html
http://korma.wmflabs.org/browser/code_contrib_new_gone.html

Under Code Review

http://korma.wmflabs.org/browser/scr.html
http://korma.wmflabs.org/browser/scr-repos.html
http://korma.wmflabs.org/browser/scr-companies.html
http://korma.wmflabs.org/browser/scr-companies-summary.html
http://korma.wmflabs.org/browser/scr-countries.html

There are many details to polish, but what we have here effectively deprecates the need of gerrit-stats. Resolving as WONTFIX.