Exporter is shutdown before controller finishes pushing metric events in otel-collector example

[kit494way]

opentelemetry-go/example/otel-collector/main.go

Lines 92 to 96 in c066f15

	// Shutdown will flush any remaining spans.
	handleErr(tracerProvider.Shutdown(ctx), "failed to shutdown TracerProvider")
	// Push any last metric events to the exporter.
	handleErr(cont.Stop(context.Background()), "failed to stop controller")

As I understand it, calling tracerProvider.Shutdown() eventually invokes Shotdown() of exporter which is shared with a controller.
As commented, cont.Stop() tries to push metric events to the exporter.
So, cont.Stop() should be called before tracerProvider.Shutdown(), or it may cause same issue with #1437 .
Is it right?

[kobim]

This probably relates to #1443 - when using NewBatchSpanProcessor the underlying exporter is also closed.
Calling cont.Stop before shutting down the exporter should resolve this.