A surprising share of "the app is down" pages resolve to a name-resolution problem, not a broken service. The service is fine; the client can't turn a name into an address. dig is the precision tool for proving that in seconds instead of guessing.
Source: [Dev.to](https://dev.to/jjoyneriv/dns-troubleshooting-with-dig-the-commands-devops-engineers-actually-need-19b0)