Using [event] to slow printer when sensor is triggered

General Discussion
1

I’m using an external custom buffer for Palette that when triggered I need the print speed to slow down. I’m using a pi 3b with octopus v1.1 board. I’ve create a separate event.cfg and included it in my printer config. I get error Section ‘event pin_change’ is not a valid config section. I can’t find any documentation on creating trigger events. I’m using a laser filament sensor as my switch on pin PG10. I’m not sure where to find the valid commands klipper supports. Any help would be appreciate. This was a piece of cake when using RRF3 Heres my macro:

[event pin_change]
pin: PG10
command: |
  {% if pin_state == "triggered" %}
    GCODE_MACRO SL_DN
  {% else %}
    GCODE_MACRO SL_UP
  {% endif %}

[gcode_macro SL_DN]
gcode:
  M220 S5

[gcode_macro SL_UP]
gcode:
  M220 S100