Per the cross-wiki watchlist RFC (T126641), we will be setting up a new database shard to host tables for the cross-wiki watchlist feature. This database will include aggregated "mega-tables" for all watchlist and recentchanges data across all the wikis (and possibly all edit tag data as well). We may also need to replicate the centralauth data on this shard.
@jcrespo suggests 2 additional servers per datacenter (T126641#2528323) to meet this request.
Labs Project Tested: Not yet
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Number of systems: 2 per data center
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