Release 23.12.1

What's Changed

Improvements

• Schema Controls best practices by @forstisabella in #4435
• Engage unsubscribe link content by @rchinn-segment in #4439
• Update "Managing Identity in AJS" page by @sarahrudy in #4434

Knowledge Centered Support

• Add sample code to pass custom field in context by @joeynmq in #4416
• Add info about source options for subdomains by @ashton-huxtable in #4397
• Update Enforce Email as Primary Identifier by @spencerattick in #4438
• Add info for cookies that set by Analytics.js by @joeynmq in #4232
• Changing a source type note by @jfoskin in #4299
• Renamed space name can't be reflected in URL. by @Panandhan22 in #4409
• Added information that sending of null property or trait is not possible. by @tanjinhong72 in #4280

Full Changelog: 23.11.2...23.12.1