Fangmin Lv created CURATOR-349:

             Summary: Expose extra metrics in TracerDeriver
                 Key: CURATOR-349
             Project: Apache Curator
          Issue Type: New Feature
          Components: Recipes
            Reporter: Fangmin Lv

Allow service instances to be temporarily removed from discovery (when using 
the Service Discovery recipe). 

This can be achieved with a new 'enabled' flag that is included as part of the 
service instance node data in Zookeeper. Updating this flag via e.g. Exhibitor 
will allow an instance to be disabled. When the flag is omitted, the service is 
assumed to be enabled, hence this change is backward compatible.

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