{"page":"/blog/log-level-data","modified":"2026-11-10","license":"https://creativecommons.org/licenses/by/4.0/","columns":["Field","What it holds","Why it matters"],"rows":[["event_time_utc","DV360 sends microseconds since 1970 in UTC","Keep full precision; it helps match records across platforms"],["auction_id","DV360's join key across view, click and conversion rows","Google says not to assume \"any ordering, structure or meaning\" in it"],["openrtb_transaction_id","The OpenRTB source.tid, where a platform exports it","DV360's field list has no such column, so this stays null for DV360 rows"],["inventory_source_external_id","The deal or inventory source DV360 attributed","The starting point for deal-level reconciliation"],["site_url","Raw URL from the bid request","Some exchanges mask it as \"source_url_hidden\""],["user_id, user_id_null_reason_groups","Tracking ID, zeroed when privacy rules apply, with a reason bitmask","1 = GOOGLE, 2 = PARTNER_POLICY in Google's reason list"],["_nanos","Costs per impression in billionths of a dollar","1,280,000 nanos = $0.00128 per impression = $1.28 CPM"],["billable_cost_nanos","Media plus partner costs billed","Here media is 78.9% of the billed amount"]],"sourceUrls":[[],[],[],[],[],[],[],[]]}