FM / data

/var/lib/cloud/data

Name	Size	Mode	Actions
instance-id	20	0644	edit dl rm
previous-datasource	39	0644	edit dl rm
previous-hostname	16	0644	edit dl rm
previous-instance-id	20	0644	edit dl rm
python-version	4	0644	edit dl rm
result.json	69	0644	edit dl rm
set-hostname	91	0644	edit dl rm
status.json	501	0644	edit dl rm

Edit: /var/lib/cloud/data/set-hostname (91B)

{ "fqdn": "ip-172-31-12-41.ap-south-1.compute.internal", "hostname": "ip-172-31-12-41" }