grpc/ttnctx/context.go
func MetadataFromIncomingContext(ctx context.Context) metadata.MD {
	md, _ := metadata.FromIncomingContext(ctx)
	return md
}
func MetadataFromIncomingContext(ctx context.Context) metadata.MD {
	md, _ := metadata.FromIncomingContext(ctx)
	return md
}
// MetadataFromIncomingContext gets the metadata from the given context