func (az *warmBackendAzure) PutWithMeta(ctx context.Context, object string, r io.Reader, length int64, meta map[string]string) (remoteVersionID, error) {
	azMeta := map[string]*string{}
	for k, v := range meta {
		azMeta[k] = to.Ptr(v)
	}
	resp, err := az.clnt.UploadStream(ctx, az.Bucket, az.getDest(object), io.LimitReader(r, length), &azblob.UploadStreamOptions{
		Concurrency: 4,
		AccessTier:  az.tier(), // set tier if specified
		Metadata:    azMeta,

            desc: "use istio.io/istio/pkg/env"
          - pkg: k8s.io/utils/strings/slices
            desc: "use istio.io/istio/pkg/slices"
          - pkg: k8s.io/utils/pointer
            desc: "use istio.io/istio/pkg/ptr"
          - pkg: go.opencensus.io
            desc: "do not use OpenCensus; use OpenTelemetry instead"
          - pkg: golang.org/x/exp/maps