OPTIONAL. A client-defined grouping key for related metadata events.
Opaque to the server: the client assigns it however it likes and the server MUST NOT interpret or validate its value. Being optional, it is fully back-compatible — omitting it leaves existing behaviour unchanged.
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OPTIONAL. Populated by the ingest server, NOT by the client.
The server SHOULD derive this from the request's HTTP
Originheader (the scheme + host + optional port of the page that produced the event, e.g. "https://example.com"). It MUST NOT be trusted as a client-supplied value. When theOriginheader is absent, the field is omitted entirely (it is never set to an empty string or a placeholder).