The documentation for "Real Life Scenario" for Web Monitoring no longer works as written, because of the change requiring the sid parameter to be provided for the Logout step.

https://www.zabbix.com/documentation/2.2/manual/web_monitoring/example

After upgrading from 2.0 to 2.2.2, my pre-existing web-monitoring of the Zabbix front end started failing. The current documentation still provides detailed instructions but they are unable to get past the login step.

Not entirely sure I fixed it the best way, but to get it working again I had to add this variable to the Log In step:

{zabbixsession}=regex:name="sid" value="([0-9a-z]*)"

And change the URL in the Logout step to:
https://server/zabbix/index.php?reconnect=1&sid={zabbixsession}