Why is this package needed?

[martint17r]

I am not sure how your code makes a difference against using the standard JSONFormatter like this:

logrus.SetFormatter(&log.JSONFormatter{
    FieldMap: logrus.FieldMap{
        logrus.FieldKeyTime:  "time",
        logrus.FieldKeyLevel: "severity",
        logrus.FieldKeyMsg:   "message",
    },
})

Could you please elaborate?

[balboah]

I was not aware of the FieldMap option, it's probably enough to use that. Thank you for providing an example

[MrWako]

... just to add that it also maps the logrus severity levels to the fluentd severity levels.