Https://esi.evetech.net/latest/characters/{character_id}/assets/ returning 404

API status route https://esi.evetech.net/status.json?version=latest

The routes that are down should surely show here as "status": "red" but they are not.

How can one even check the status on a dashboard or notify if they are not showing as red?

To see this in PowerShell (pwsh) you can do the following to get it in a table format

PS>  Invoke-WebRequest https://esi.evetech.net/status.json?version=latest | ConvertFrom-Json | Format-Table

or

PS>  Invoke-RestMethod https://esi.evetech.net/status.json?version=latest | Format-Table

This even works on Linux if you have .Net PowerShell installed, if you want the equivilent in bash you can use curl to query and jq to reshape the output.