| "flat_key","key","int_value","string_value" |
| "chrome_hashed_performance_mark.mark","chrome_hashed_performance_mark.mark","[NULL]","mark2" |
| "chrome_hashed_performance_mark.mark_hash","chrome_hashed_performance_mark.mark_hash",20,"[NULL]" |
| "chrome_hashed_performance_mark.site","chrome_hashed_performance_mark.site","[NULL]","site1" |
| "chrome_hashed_performance_mark.site_hash","chrome_hashed_performance_mark.site_hash",10,"[NULL]" |
| "event.category","event.category","[NULL]","cat1" |
| "event.name","event.name","[NULL]","slice1" |
| "is_root_in_scope","is_root_in_scope",1,"[NULL]" |
| "source","source","[NULL]","descriptor" |
| "source_id","source_id",12345,"[NULL]" |
