Your node has all needed data. It was not available for the external services. And you can request this data to see when it’s happened. You can also configure an uptimerobot.com monitoring to have a nice GUI.
In Windows, could you please open a PowerShell window and paste there a command, then copy results?
cmd.exe will not work.
Sorry, I do not know what OS are you running now, you didn’t tell that in this thread, so I’m forced to guess.
The command will show you when your node was offline, but not why.
It can be your ISP, router, PC, power outage, OS upgrade, BSOD or kernel panic - anything.
The reason impossible to figure out only with storagenode. You need to check all your infrastructure. The storagenode can only show when the problem was.
The storagenode stores detailed data for audit checks in databases. And it has rolling window.
For today the earliest record would be 2021-06-08T21:07:00Z. So all records before that already gone.