Linkd has been removed in OpenNMS Horizon 16. New Enlinkd daemon (extended linkd). You can find the configuration in etc / enlinkd-configuration.xml. It looks like the old linkd configuration. see notes at https://www.opennms.org/wiki/Map_Use_Cases_2015#Linkd_and_EnLinkd
Remember to enable the Enlinkd daemon if it is not in service-configuration.xml.
I also updated the Linkd widget page with a note.
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