guide/blueprints/example_yaml/enricher-transformer.yaml

brooklyn.enrichers:
- type: org.apache.brooklyn.enricher.stock.Transformer
  brooklyn.config:
    enricher.sourceSensor: $brooklyn:sensor("urls.tcp.string")
    enricher.targetSensor: $brooklyn:sensor("urls.tcp.withBrackets")
    enricher.targetValue: $brooklyn:formatString("[%s]", $brooklyn:attributeWhenReady("urls.tcp.string"))