Logrus: Add possibility to create default Fields.

[vagruchi]

There are many things, what must be in every entry. For example appname or hostname.
This can be added to Logger or to Formatters. I think modify Formatters is better decision.

[dclendenan]

I've had similar thoughts, and used this functionality in other loggers (in other languages). I'll look into this once my current PR is merged.

[bonds0097]

Does passing around a logrus.FieldLogger not satisfy this requirement?

[stevvooe]

@PurpureGecko Do you have a proposed design? PR?

[stevvooe]

Actually, this is fairly easily done by passing around a log.Entry populated with the fields:

logger := logrus.WithField("default", "foo")
logger.Info("will have default")

This has been sufficient in a number of applications. You can even store the logger in a context to make it accessible in cross-cutting areas.

Closing this. If this is insufficient, please propose a solution with a PR.

[mcuadros]

The problem is that with the current implementation you can't add default fields to the standard logger.