// Use buffered channel to take care of burst sends or slow w.Write()
	err = globalTrace.SubscribeJSON(traceOpts.TraceTypes(), out, ctx.Done(), func(entry madmin.TraceInfo) bool {
		return shouldTrace(entry, traceOpts)
	}, &wg)
	if err != nil {
		return grid.NewRemoteErr(err)
	}

	// Publish bootstrap events that have already occurred before client could subscribe.