https://www.juniper.net/documentation/us/en/software/junos/routing-policy/topics/concept/firewall-filter-stateless-option-rate-limits-overview.html
Stateless Firewall Filters That Reference Policers Overview | Junos OS | Juniper Networks
Policing, or rate limiting, is an important component of firewall filters that lets you limit the amount of traffic that passes into or out of an interface.
stateless firewalljunos osfiltersreference