Due to #4127 search for parameters was disabled and removed from the code (and a hint was given in the release notes of 1.22). This means the only way for us to see, which hosts have a certain parameter value, is currently to do it directly on the database with this query:

select parameters.value, hosts.name from parameters join hosts on parameters.reference_id=hosts.id where parameters.name like 'some_parameter_name' and parameters.value like '%some_parameter_value%';

With this feature request we wish to have the search for host parameters back (if it is technically possible somehow) in the UI and in the API, because we need it on a daily basis.