= Gerrit Code Review - Change metadata plugin API

This API is provided by
link:pg-plugin-dev.html#change-metadata[plugin.changeMetadata()] and provides
interface for customization and data updates of change metadata.

== onLabelsChanged
`changeMetadataApi.onLabelsChanged(callback)`

.Params
- *callback* function that's executed when labels changed on the server.
Callback receives labels with scores applied to the change, map of the label
names to link:rest-api-changes.html#label-info[LabelInfo] entries

.Returns
- `GrChangeMetadataApi` for chaining.
