The era family is an implementation of Event-Recording Automata (ERA), which is a type of timed automata in which each event has a clock that counts the time that has passed since the last occurrence of the event.
A declaration of the era family is in the following file:
/opt/KasperskyOS-StarterKit-<version>/sysroot-x86_64-pc-kos/include/kss/server/era.cfg