Complete profile of mongodb databases

Mongodb: Enable tracking for all queries on all databases

var mongo = db.getMongo()
var dbs = db.getMongo().getDBNames()

//Step 1 drop all existing profile and recreate profile with bigger collections.
for(var i in dbs){
    db = db.getMongo().getDB( dbs[i] );
    var name = db.getName();
    if (name.startsWith("jarvis")) 
    {
        db.setProfilingLevel(0)
        db.system.profile.drop()
        db.createCollection( "system.profile", { capped: true, size:40000000 } )
        db.setProfilingLevel(1, 0) 
    }
}

//this code can be run periodically to copy all profiling into a single unique collection
var targetDBName = "profile"; // Change this to the name of the target database
var targetCollectionName = "systemprofile"; // Change this to the name of the target collection

mongo.getDB(targetDBName).getCollection(targetCollectionName).drop()

//now iterate over all database and copy data into another collection
for(var i in dbs){
    db = db.getMongo().getDB( dbs[i] );
    var name = db.getName();
    if (name.startsWith("jarvis")) 
    {
        print ('copy data of: ' + name);
         db.getCollection('system.profile').aggregate([
            {
                $merge: {
                    into: {
                        db: targetDBName,
                        coll: targetCollectionName
                    },
                    whenMatched: "replace", // You can choose "replace", "keepExisting", or "fail" if you want a different behavior when documents with the same _id exist in the target collection
                    whenNotMatched: "insert"
                }
            }
        ]);
            print ('FINISHED: copy data of: ' + name);
    }
}

//then perform some aggregation to verify which collection is more impacted.
db.getCollection('systemprofile').aggregate([
{$match : {"command.aggregate" : {$ne : "system.profile"}}},
{$project : {signature : {$concat: ["$op", '/', "$ns"]}}},
{$group : {_id : "$signature", Sum : {$sum : 1}}},
{$sort : {Sum : -1}}
])


//run this code to drop everything.
for(var i in dbs){
    db = db.getMongo().getDB( dbs[i] );
    var name = db.getName();
    if (name.startsWith("jarvis")) 
    {
        db.setProfilingLevel(0)
        db.system.profile.drop()
    }
}