func google.golang.org/grpc.Trailer

2 uses

	google.golang.org/grpc (current package)
		rpc_util.go#L213: func Trailer(md *metadata.MD) CallOption {

	cloud.google.com/go/profiler
		profiler.go#L332: 		p, err = a.client.CreateProfile(ctx, &req, grpc.Trailer(&md))