The South Asia Outage post has all the available information and will be updated if any additional information is found.
I could not determine what the cause of the issue was. It appears to have been limited to some Oracle Cloud IP ranges for the us-ashburn-1 data center routing to the South Asia regions limited to AWS ap-south-1 and Google Cloud asia-south1. I know this because I started an AWS instance in ap-south-1 and noticed some of the other servers I have running in Oracle us-ashburn-1 were working and some were not. Additionally the Status Monitoring checks for multiple regions including Asia and it did not have any issues so it couldn’t have been all of Asia.
It was likely a BGP routing misconfiguration for those Oracle Cloud IP ranges in the South Asia data center regions. These types of outages have happened in the past where IP ranges become unavailable in specific regions due to BGP routing problems.
I think the limited information on the issue is because Oracle Cloud already represents a small share of data center providers and traffic between us-ashburn-1 and South Asia is an even smaller share.