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More template stage examples. #2606

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Sep 10, 2020
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More template stage examples. #2606

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12 changes: 12 additions & 0 deletions docs/sources/clients/promtail/stages/template.md
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Expand Up @@ -99,6 +99,18 @@ function](https://golang.org/pkg/strings/#Replace). When the template executes,
the entire contents of the `app` key from the extracted map will have at most
`1` instance of `loki` changed to `blokey`.

A special key named `Entry` can be used to reference the current line, this can be useful when you need to append/prepend the log line.

```yaml
- template:
source: message
template: '{{.app }}: {{ .Entry }}'
- output:
source: message
```

The snippet above will for instance prepend the log line with the application name.

## Supported Functions

### ToLower & ToUpper
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