Related tasks

1. T241921: Fix Wikimedia captchas
2. {T125132} (and open subs)
3. T247117: Create dashboard with captcha stats
4. T152219: Statistics on Captcha success/failure rate
5. T185870: Monitor registration rates to make sure captcha changes have no negative effects
6. {T183869#3994130}

Current statistical tools

1. grafana dashboards
   1. https://grafana.wikimedia.org/d/000000004/authentication-metrics?orgId=1
   2. https://grafana.wikimedia.org/d/000000370/captcha-failure-rates?orgId=1
2. logstash
   1. channel:captcha
   2. channel:authentication ?
   3. channel:authevents ?

Desired logging and metrics functionality

1. TBD