[[MediaWiki:Globalblocking-logentry-whitelist/en]] and [[MediaWiki:Globalblocking-logentry-dewhitelist/en]]

I think $3 means the IP or CIDR being locally whitelisted or de-whitelisted.

I did some testing at <https://es.wikibooks.org/wiki/Especial:Registro/gblblock>. Indeed $3 seems to be User:<blockedIP/blockedrange> being whitelisted. I'll update the docs.

The problem comes from Template:Logentry which has hardcoded settings. It's not something we can change from gerrit unless we rewrite the entire message. Maybe we can amend the template so it is more customizable. Ping @Nemo bis and Nikerabbit:.