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