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out_loki: make it clear setting labels removes the keys from record #1536

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out_loki: make it clear setting labels removes the keys from record #1536

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4 changes: 3 additions & 1 deletion pipeline/outputs/loki.md
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Expand Up @@ -35,7 +35,7 @@ Be aware there is a separate Golang output plugin provided by [Grafana](https://

## Labels

Loki store the record logs inside Streams, a stream is defined by a set of labels, at least one label is required.
Loki stores the record logs inside Streams, a stream is defined by a set of labels, at least one label is required.

Fluent Bit implements a flexible mechanism to set labels by using fixed key/value pairs of text but also allowing to set as labels certain keys that exists as part of the records that are being processed.
Consider the following JSON record \(pretty printed for readability\):
Expand Down Expand Up @@ -88,6 +88,8 @@ When processing that new configuration, the internal labels will be:
job="fluentbit", mystream="stdout"
```

Extracting keys to labels through `labels`, `label_keys` or `label_map_path` will remove those keys from the record.

### Using the `label_keys` property

The additional configuration property called `label_keys` allow to specify multiple record keys that needs to be placed as part of the outgoing Stream Labels, yes, this is a similar feature than the one explained above in the `labels` property.
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