Return the size/usage properties associated with a collection in a Cosmos DB database. While not officially documented, the below contains the list of properties and their expected usage:

collectionSize : Size of the entire collection, including indexes. documentsCount : Count of documents in the collection. documentsSize : Size (in KB) of all documents in the collection. documentSize : Size (in MB) of all documents in the collection. functions : Count of functions in the collection. storedProcedures: Count of stored procedures in the collection. triggers : Count of triggers in the collection.

Get-CosmosDbCollectionSize -Context <Context> [-Key <SecureString>] [-KeyType <String>] [-Database <String>]
 [-Id <String>] [<CommonParameters>]

Get-CosmosDbCollection -Account <String> [-Key <SecureString>] [-KeyType <String>] [-Database <String>]
 [-Id <String>] [<CommonParameters>]

This cmdlet will return the size properties of a given collection in a Cosmos DB database. The Id for the collection must be passed.

PS C:\> Get-CosmosDbCollectionSize -Context $cosmosDbContext -Id 'MyNewCollection'

Get the usage properties associated with MyNewCollection collection from a database.

The account name of the Cosmos DB to access.

Type: String
Parameter Sets: Account
Aliases:

Required: True
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

This is an object containing the context information of the Cosmos DB database containing the collection. It should be created by `New-CosmosDbContext`.

Type: Context
Parameter Sets: Context
Aliases: Connection

Required: True
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

The name of the database to access in the Cosmos DB account.

Type: String
Parameter Sets: (All)
Aliases:

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

This is the id of the collection to get.

Type: String
Parameter Sets: (All)
Aliases: Name

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

The key to be used to access this Cosmos DB.

Type: SecureString
Parameter Sets: (All)
Aliases:

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False

The type of key that will be used to access ths Cosmos DB.

Type: String
Parameter Sets: (All)
Aliases:
Accepted values: master, resource

Required: False
Position: Named
Default value: Master
Accept pipeline input: False
Accept wildcard characters: False

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters (http://go.microsoft.com/fwlink/?LinkID=113216).