Based on the result of T223270, we would like to know how often users attempt to save aliases containing pipe | characters.
A log entry is made each time a user attempts this, either through Special:SetAliases or through Special:SetLavelDescriptionAliases.
We need to count those log entries. The easiest would be adding a Grafana board for this data.
So the logging ends up in logstash.
Rather than add any aditional metric tracking for statsd and thus graphite we can just look at https://logstash.wikimedia.org/goto/2e6046d9ed165ddb1aa8945cfefbd74b
It's only been deployed for roughly 5 days so far, and so far no occourances on wikidata.org.
I triggered 2 errors on test wikidata today to proove that the logging is working