I have tried adding debug to qemu-ga by running it with "-v"
This is the output (quite useless):
....
1637443549.171361: debug: received EOF
1637443549.271676: debug: received EOF
1637443549.371984: debug: received EOF
1637443549.472366: debug: received EOF
1637443549.572709: debug: received EOF
1637443549.672992: debug: received EOF
1637443549.773299: debug: received EOF
1637443549.873531: debug: received EOF
1637443549.973770: debug: received EOF
1637443550.74010: debug: received EOF
1637443550.174254: debug: received EOF
1637443550.274485: debug: received EOF
1637443550.374718: debug: received EOF
1637443550.474979: debug: read data, count: 107, data: {"execute":"guest-sync-delimited","arguments":{"id":14277701}}
{"execute":"guest-shutdown","arguments":{}}
1637443550.475015: debug: process_event: called
1637443550.475017: debug: processing command
1637443550.475033: debug: sending data, count: 22
1637443550.475064: debug: process_event: called
1637443550.475065: debug: processing command
1637443550.475949: debug: sending data, count: 85
1637443550.476270: debug: received EOF
1637443550.576487: debug: received EOF
1637443550.676752: debug: received EOF
1637443550.776995: debug: received EOF
1637443550.877230: debug: received EOF
1637443550.977466: debug: received EOF
1637443551.77712: debug: received EOF
1637443551.177949: debug: received EOF
1637443551.278182: debug: received EOF
1637443551.378414: debug: received EOF
1637443551.478652: debug: received EOF
1637443551.578900: debug: received EOF
1637443551.679143: debug: received EOF
1637443551.779237: debug: received EOF