travis-cook-sfdc commented on issue #28870:
URL: https://github.com/apache/airflow/issues/28870#issuecomment-1387738430

   After a little more investigation, I think that example only works because 
the extra link is registered as a provider which doesn't require explicit 
instantiation.  If you want to register it as a plugin, i.e.:
   
   ```
   class MultiLinksPlugin(AirflowPlugin):
       name = "extra_link_plugin"
       operator_extra_links = [
           BigQueryConsoleIndexableLink(0),
       ]
   ```
   
   You have to specify an index which forces an explicit number of buttons at a 
time when it's unknown.


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