Database
[{ip:"192.2.1.1",country:"US",type:"Visitors",date:"2019-12-15T00:00:00.359Z"},{ip:"192.3.1.8",country:"UK",type:"Visitors",date:"2019-12-15T00:00:00.359Z"},{ip:"192.5.1.4",country:"UK",type:"Visitors",date:"2019-12-15T00:00:00.359Z"},{ip:"192.8.1.7",country:"US",type:"Visitors",date:"2019-12-15T00:00:00.359Z"},{ip:"192.1.1.3",country:"US",type:"Visitors",date:"2019-12-15T00:00:00.359Z"}]
Query
db.collection.aggregate([{$group:{_id:null,docsCount:{$sum:1},originals:{$push:"$$ROOT"}}},{$unwind:"$originals"},{$group:{_id:"$originals.country",totalSessions:{$sum:1},totalVisitors:{$first:"$docsCount"}}}])