Where are records such as this one coming from? They appear on request table as of now

{
"hostname":null,"sequence":null,"dt":null,"time_firstbyte":null,"ip":null,"cache_status":null,"http_status":null,"response_size":null,"http_method":null,

"uri_host":"www.wikipedia.org",
"uri_path":"http://www.wikipedia.org",

"uri_query":"","content_type":null,"referer":null,"x_forwarded_for":null,"user_agent":null,"accept_language":null,"x_analytics":null,"range":null,"is_pageview":null,"record_version":null,"client_ip":null,"geocoded_data":null,"x_cache":null,"user_agent_map":null,"x_analytics_map":null,"ts":null,"access_method":null,"agent_type":"user","is_zero":null,"referer_class":null,"normalized_host":null,"pageview_info":null,"page_id":null,

"webrequest_source":"text","year":2016,"month":5,"day":30,"hour":1
}