prometheus/scripts/errcheck_excludes.txt

// Don't flag lines such as "io.Copy(ioutil.Discard, resp.Body)".
io.Copy
// The next two are used in HTTP handlers, any error is handled by the server itself.
io.WriteString
(net/http.ResponseWriter).Write
// No need to check for errors on server's shutdown.
(*net/http.Server).Shutdown

// Never check for logger errors.
(github.com/go-kit/log.Logger).Log

// Never check for rollback errors as Rollback() is called when a previous error was detected.
(github.com/prometheus/prometheus/storage.Appender).Rollback