Github user geomacy commented on a diff in the pull request:
https://github.com/apache/brooklyn-docs/pull/159#discussion_r108871926
--- Diff: guide/java/policies.md ---
@@ -235,6 +235,30 @@ An Enricher which computes latency in accessing a URL.
Can be used to combine the values of sensors. This enricher should be
instantiated using Enrichers.buider.combining(..).
This enricher is only available in Java blueprints and cannot be used in
YAML.
+#### Note On Enricher Producers
+
+`enricher.producer: brooklyn:entity("entity.id.here")` is a
`brooklyn.config` key/value pair that should be supplied to any
+enricher that has an `enricher.sourceSensor` value that comes from an
entity that is different from the entity on which the
+enricher is defined.
+
+For example, if we consider the Transfomer from above, suppose that
`enricher.sourceSensor: $brooklyn:sensor("urls.tcp.list")`
+is actually a sensor on a different entity called `load.balancer`. In this
case, we would need to supploy an
+`enricher.producer` value.
+
+{% highlight yaml %}
+brooklyn.enrichers:
+- type: org.apache.brooklyn.enricher.stock.Transformer
+ brooklyn.config:
+ enricher.producer: brooklyn:entity("load.balancer")
--- End diff --
You're missing the `$` in front of `brooklyn:`.
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