Breaking Change: Certificates used to encrypt/decrypt passwords in DSC configurations may not work after installing WMF 5.0 RTM. In WMF 4.0 and WMF 5.0 Preview releases, DSC would not allow passwords in the configuration to be of length more than 121 characters. DSC was forcing to use short passwords even if lengthy and strong password was desired.
Virtual Machine Scale Sets can be used with the Azure Desired State Configuration (DSC) extension handler. Virtual machine scale sets provide a way to deploy and manage large numbers of virtual machines, and can elastically scale in and out in response to load.