[7.x] [alerting] adds doc on JSON-expanded action variables and task manager max_workers (#92720)#93521

kibanamachine merged 1 commit intoelastic:7.xelastic/kibana:7.xfrom

kibanamachine:backport/7.x/pr-92720kibanamachine/kibana:backport/7.x/pr-92720Copy head branch name to clipboard