telegraf/docs/PROCESSORS.md

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### Processor Plugins
This section is for developers who want to create a new processor plugin.
### Processor Plugin Guidelines
* A processor must conform to the [telegraf.Processor][] interface.
* Processors should call `processors.Add` in their `init` function to register
themselves. See below for a quick example.
* To be available within Telegraf itself, plugins must add themselves to the
`github.com/influxdata/telegraf/plugins/processors/all/all.go` file.
* The `SampleConfig` function should return valid toml that describes how the
processor can be configured. This is include in the output of `telegraf
config`.
- The `SampleConfig` function should return valid toml that describes how the
plugin can be configured. This is included in `telegraf config`. Please
consult the [SampleConfig][] page for the latest style guidelines.
* The `Description` function should say in one line what this processor does.
- Follow the recommended [CodeStyle][].
### Processor Plugin Example
```go
package printer
// printer.go
import (
"fmt"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/processors"
)
type Printer struct {
}
var sampleConfig = `
`
func (p *Printer) SampleConfig() string {
return sampleConfig
}
func (p *Printer) Description() string {
return "Print all metrics that pass through this filter."
}
func (p *Printer) Apply(in ...telegraf.Metric) []telegraf.Metric {
for _, metric := range in {
fmt.Println(metric.String())
}
return in
}
func init() {
processors.Add("printer", func() telegraf.Processor {
return &Printer{}
})
}
```
[SampleConfig]: https://github.com/influxdata/telegraf/wiki/SampleConfig
[CodeStyle]: https://github.com/influxdata/telegraf/wiki/CodeStyle
[telegraf.Processor]: https://godoc.org/github.com/influxdata/telegraf#Processor