Changes to Record Discovery Hit

added the new optional request property oneOf[subschema #1: DiscoveryHit]/link_provenance

added the new optional request property oneOf[subschema #1: DiscoveryHit]/browser/anyOf[subschema #1: BrowserIdentity]/arrival_id

added the new optional request property oneOf[subschema #2: BrowserPageSignal]/browser/arrival_id

the request's body type changed from object to no type

removed the request property browser

removed the request property count_as_page_fetch

removed the request property fetcher

removed the request property host

removed the request property method

removed the request property navigation

removed the request property occurred_at

removed the request property page_revision

removed the request property path

removed the request property prefetch

removed the request property proxy_outcome

removed the request property proxy_status

removed the request property referrer_host

removed the request property request_id

removed the request property rsc

removed the request property sampling_rate

removed the request property transition

removed the request property type

removed the request property user_agent

removed the request property user_id

removed the request property utm_source

removed the request property viewer

added request discriminator

added DiscoveryHit BrowserPageSignal to the request body oneOf list

added the new optional request property browser

added the new optional request property occurred_at

added the new optional request property proxy_outcome

added the new optional request property proxy_status

added the new optional request property user_id

added the new optional request property utm_source

added the new muse enum value to the request property fetcher

added the new optional request property transition

added the new optional request property viewer

added the new mcp enum value to the request property fetcher

added the new optional request property sampling_rate

endpoint added