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docs(aggregators): Clean up aggregator docs (#15357)

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docs/AGGREGATORS.md
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@ -11,19 +11,42 @@ This section is for developers who want to create a new aggregator plugin.
using a file in `github.com/influxdata/telegraf/plugins/aggregators/all`
named according to the plugin name. Make sure you also add build-tags to
conditionally build the plugin.
* Each plugin requires a file called `sample.conf` containing the sample configuration
for the plugin in TOML format.
Please consult the [Sample Config][] page for the latest style guidelines.
* Each plugin `README.md` file should include the `sample.conf` file in a section
describing the configuration by specifying a `toml` section in the form `toml @sample.conf`. The specified file(s) are then injected automatically into the Readme.
* Each plugin requires a file called `sample.conf` containing the sample
configuration for the plugin in TOML format. Please consult the
[Sample Config][] page for the latest style guidelines.
* Each plugin `README.md` file should include the `sample.conf` file in a
section describing the configuration by specifying a `toml` section in the
form `toml @sample.conf`. The specified file(s) are then injected
automatically into the Readme.
* The Aggregator plugin will need to keep caches of metrics that have passed
through it. This should be done using the builtin `HashID()` function of
each metric.
* When the `Reset()` function is called, all caches should be cleared.
* Follow the recommended [Code Style][].
[telegraf.Aggregator]: https://godoc.org/github.com/influxdata/telegraf#Aggregator
[Sample Config]: /docs/developers/SAMPLE_CONFIG.md
[Code Style]: /docs/developers/CODE_STYLE.md
### Aggregator Plugin Example
### Registration
Registration of the plugin on `plugins/aggregators/all/min.go`:
```go
//go:build !custom || aggregators || aggregators.min
package all
import _ "github.com/influxdata/telegraf/plugins/aggregators/min" // register plugin
```
The _build-tags_ in the first line allow to selectively include/exclude your
plugin when customizing Telegraf.
### Plugin
Content of your plugin file e.g. `min.go`
```go
@ -125,21 +148,3 @@ func init() {
})
}
```
Registration of the plugin on `plugins/aggregators/all/min.go`:
```go
//go:build !custom || aggregators || aggregators.min
package all
import _ "github.com/influxdata/telegraf/plugins/aggregators/min" // register plugin
```
The _build-tags_ in the first line allow to selectively include/exclude your
plugin when customizing Telegraf.
[Sample Config]: https://github.com/influxdata/telegraf/blob/master/docs/developers/SAMPLE_CONFIG.md
[Code Style]: https://github.com/influxdata/telegraf/blob/master/docs/developers/CODE_STYLE.md
[telegraf.Aggregator]: https://godoc.org/github.com/influxdata/telegraf#Aggregator