Capabilitites/mod/tracker:manage
From MoodleDocs
Users who have this capability can manage tracker's form structure, by defining, adding or removing custom form elements.
This is basically a Tracker administrator typical capability.
Note: You are currently viewing documentation for Moodle 3.3. Up-to-date documentation for the latest stable version of Moodle is probably available here: Capabilitites/mod/tracker:manage.