[8.x] [OBX-UX-MGMT][BUG] Fix chart in Custom Threshold rule when the field name has slashes (#209263)#209524

kibanamachine merged 2 commits intoelastic:8.xelastic/kibana:8.xfrom

kibanamachine:backport/8.x/pr-209263kibanamachine/kibana:backport/8.x/pr-209263Copy head branch name to clipboard