klog is a permanent fork of https://github.com/golang/glog.
## Why was klog created?
The decision to create klog was one that wasn't made lightly, but it was necessary due to some
drawbacks that are present in [glog](https://github.com/golang/glog). Ultimately, the fork was created due to glog not being under active development; this can be seen in the glog README:
> The code in this repo [...] is not itself under development
This makes us unable to solve many use cases without a fork. The factors that contributed to needing feature development are listed below:
*`glog` [presents a lot "gotchas"](https://github.com/kubernetes/kubernetes/issues/61006) and introduces challenges in containerized environments, all of which aren't well documented.
*`glog` doesn't provide an easy way to test logs, which detracts from the stability of software using it
* A long term goal is to implement a logging interface that allows us to add context, change output format, etc.
- If you want to redirect everything logged using klog somewhere else (say syslog!), you can use `klog.SetOutput()` method and supply a `io.Writer`. (See `examples/set_output/usage_set_output.go`)
- For more logging conventions (See [Logging Conventions](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-instrumentation/logging.md))
This package can be used side by side with glog. [This example](examples/coexist_glog/coexist_glog.go) shows how to initialize and syncronize flags from the global `flag.CommandLine` FlagSet. In addition, the example makes use of stderr as combined output by setting `alsologtostderr` (or `logtostderr`) to `true`.