FindCustomMetaDataAndUpdate.ps1

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 #############Script Overview#################################################################
##########This script provide helps finding the missing metadata keys of all blob files of a contianer and to update it#########################



$StorageAccountName ="<Storage Account Name>" #storage Account Name
$StorageAccountKey ="<Storage Account key>" #Storage Account Key
$ContainerName ="<container name>"  # Container Name
$Context =New-AzureStorageContext -StorageAccountName $StorageAccountName -StorageAccountKey $StorageAccountKey

#This will list all the blobs inside a container which do not have the 'customkey' metedata in it
$Blobs =Get-AzureStorageBlob -Container $ContainerName  -Context $Context | Where-Object {!$_.ICloudBlob.Metadata.ContainsKey("customkey")}

#This will list all the blobs inside a container which do  have the 'customkey' metedata and but have empty '' values in the 'customkey' metadata. you can chnage the empty values to any values you want to compare against
$BlobsWithEmptyMetadata =Get-AzureStorageBlob -Container $ContainerName  -Context $Context | Where-Object {$_.ICloudBlob.Metadata.ContainsKey("customkey")} |  Where-Object {$_.ICloudBlob.Metadata["customkey"] -eq ""}


#Then loop through each blob which are missing specific metadata key to do the operation you want. I am just listing the name of each blob here.  
     foreach ($Blob in $Blobs)
    { 

       echo $Blob.Name
    }

    # loop through each blob which have empty values in specific metadata key to do the operation you want. I am just listing the name of each blob here.  
     foreach ($Blob in $BlobsWithEmptyMetadata)
    { 

       echo $Blob.Name
    }