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Update faq.md #10

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Expand Up @@ -26,6 +26,8 @@ Planned, see [#478](https://github.com/provectus/kafka-ui/issues/478)

### Smart filters syntax

To use smart filters you have to enable groovy filters. To do so just add filtering.groovy.enabled=true in the [configuration](https://docs.kafka-ui.provectus.io/configuration/configuration-file).

**Variables bound to groovy context**: partition, timestampMs, keyAsText, valueAsText, header, key (json if possible), value (json if possible).

**JSON parsing logic**:
Expand All @@ -36,7 +38,7 @@ Key and Value (if they can be parsed to JSON) they are bound as JSON objects, ot

1. `keyAsText != null && keyAsText ~"([Gg])roovy"` - regex for key as a string
2. `value.name == "iS.ListItemax" && value.age > 30` - in case value is json
3. `value == null && valueAsText != null` - search for values that are not nulls and are not json
3. `value != null && valueAsText != null` - search for values that are not nulls and are not json
4. `headers.sentBy == "some system" && headers["sentAt"] == "2020-01-01"`
5. multiline filters are also allowed:

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