What role or access do users need to act on a signal to reset a baseline or dismiss a signal?

Users with the admin, pa_admin, or pa_kpi_signal_admin role can reset a baseline or dismiss a

signal without being a responsible user.

Users with other roles must become responsible users to take such actions. These users also need a

role that gives them access to a relevant workspace.

You can assign responsibility for KPI Signals for a KPI to yourself or someone else. You can also

unassign responsibility.

Reference:

https://docs.servicenow.com/bundle/quebec-now-intelligence/page/use/par-forworkspace/concept/kpi-signals-responsible-users.html