  The ATLAS trigger system is a crucial component of the ATLAS experiment at
the LHC. It is responsible for selecting events in line with the ATLAS physics
programme. This paper presents an overview of the changes to the trigger and
data acquisition system during the second long shutdown of the LHC, and shows
the performance of the trigger system and its components in the proton-proton
collisions during the 2022 commissioning period as well as its expected
performance in proton-proton and heavy-ion collisions for the remainder of the
third LHC data-taking period (2022-2025).
