prometheus/vendor/k8s.io/klog/README.md

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# klog-gokit
This packages is a replacement for [klog](https://github.com/kubernetes/klog)
in projects that use the [go-kit logger](https://godoc.org/github.com/go-kit/kit/log).
It is heavily inspired by the [`github.com/kubermatic/glog-gokit`](https://github.com/kubermatic/glog-gokit) package.
## Usage
Override the official klog package with this one.
This simply replaces the code in `vendor/k8s.io/klog` with the code of this package.
**With dep**
In your `Gopkg.toml`:
```toml
[[override]]
name = "k8s.io/klog"
source = "github.com/simonpasquier/klog-gokit"
```
**With Go modules**
Add this line to your `go.mod` file:
```
replace k8s.io/klog => github.com/kubermatic/klog-gokit master
```
In your `main.go`:
```go
// Import the package like it is original klog
import "k8s.io/klog"
// Create go-kit logger in your main.go
logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stdout))
logger = log.With(logger, "ts", log.DefaultTimestampUTC)
logger = log.With(logger, "caller", log.DefaultCaller)
logger = level.NewFilter(logger, level.AllowAll())
// Overriding the default klog with our go-kit klog implementation.
// Thus we need to pass it our go-kit logger object.
klog.SetLogger(logger)
```
Setting the logger to the klog package **MUST** happen before using klog in any package.
## Function Levels
| klog | gokit |
| ------------ | ----- |
| Info | Debug |
| InfoDepth | Debug |
| Infof | Debug |
| Infoln | Debug |
| Warning | Warn |
| WarningDepth | Warn |
| Warningf | Warn |
| Warningln | Warn |
| Error | Error |
| ErrorDepth | Error |
| Errorf | Error |
| Errorln | Error |
| Exit | Error |
| ExitDepth | Error |
| Exitf | Error |
| Exitln | Error |
| Fatal | Error |
| FatalDepth | Error |
| Fatalf | Error |
| Fatalln | Error |
This table is rather opinionated and build for use with the Kubernetes' [Go client](https://github.com/kubernetes/client-go).
## License
Apache License 2.0, see [LICENSE](https://github.com/simonpasquier/klog-gokit/blob/master/LICENSE).