After the initial analysis of entry point instrumentation events (T295757#8256279) the following metadata was identified as missing:
- web_session_id and web_pageview_id (part of https://wikitech.wikimedia.org/wiki/Metrics_Platform/Analytics/Fragments#Web_Identifiers)
- translation_target_language
- translation_source_language
This ticket proposes to add such metadata for the different entry points instrumented (T301222).