Запуск

$ docker exec -it agis-mongo-db mongo
> show dbs
> use zander
> show collections

Статистика вариант 1

var mgo = new Mongo()

function getReadableFileSizeString(fileSizeInBytes) {

    var i = -1;
    var byteUnits = [' kB', ' MB', ' GB', ' TB', 'PB', 'EB', 'ZB', 'YB'];
    do {
        fileSizeInBytes = fileSizeInBytes / 1024;
        i++;
    } while (fileSizeInBytes > 1024);

    return Math.max(fileSizeInBytes, 0.1).toFixed(1) + byteUnits[i];
};

function getStatsFor(db){
    var collectionNames = db.getCollectionNames(), stats = [];
    collectionNames.forEach(function (n) { stats.push(db.getCollection(n).stats()); });
    stats = stats.sort(function(a, b) { return b['size'] - a['size']; });
    for (var c in stats) { print(stats[c]['ns'] + ": " + getReadableFileSizeString(stats[c]['size']) + " (" + getReadableFileSizeString(stats[c]['storageSize']) + ")"); }
}

function getAllStats(){
    mgo.getDBNames().forEach(function(name){ var db = mgo.getDB(name); print('\n    '+db+'\n'); getStatsFor(db) })
}

getAllStats()

Результат

    lb-identity-service
lb-identity-service.identity-role: 67.0 kB (40.0 kB)
lb-identity-service.identity-user: 2.3 kB (32.0 kB)
lb-identity-service.identity-useridentity-role: 0.5 kB (32.0 kB)

    local
local.startup_log: 104.7 kB (52.0 kB)

    zander
zander.values201: 26.6 GB (6.2 GB)
zander.objectValues201: 24.0 GB (6.7 GB)
zander.message201: 21.5 GB (5.4 GB)
zander.logg201: 12.2 GB (3.3 GB)
zander.fs.chunks: 9.2 GB (9.1 GB)
zander.odataOpuConsumptionReading: 1.2 GB (278.7 MB)
zander.values: 1003.8 MB (253.3 MB)

Статистика вариант 2

function getCollectionSizes() {
    db.getCollectionNames().map(function(name) {
        return {"name":name, "size": db.getCollection(name).stats()["size"] || 0};
    }).sort(function(a, b) {
        return b["size"] - a["size"];
    }).forEach(function(x) {
        // MongoDB JavaScript Engine does not support string.padEnd
        let pad = "                ";
        print(x.name + pad.slice(0, Math.max(16 - x.name.length, 0)) + ":\t" + x.size);
    });
}
getCollectionSizes();

Результат

values201       :       28512035211
objectValues201 :       25813237601
message201      :       23044451628
logg201         :       13106602059
fs.chunks       :       9846541595
odataOpuConsumptionReading:     1288808159
values          :       1052508175
odataByHoursZones2:     791091960
opuReadings     :       470658787
opuConsumptionHour:     461311843