fluentd loki plugin README: add note about labels (#1909)

* fluentd loki plugin README: add note about labels * fluentd loki plugin README: PR feedback
grafana · Apr 7, 2020 · 0dc0585 · 0dc0585
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diff --git a/docs/clients/fluentd/README.md b/docs/clients/fluentd/README.md
@@ -11,6 +11,9 @@ $ gem install fluent-plugin-grafana-loki
 ```
 
 ## Usage
+
+**Note**: use either `<label>...</label>` or `extra_labels` to set at least one label!
+
 In your Fluentd configuration, use `@type loki`. Additional configuration is optional, default values would look like this:
 ```
 <match **>