Problem:

When exiting a program running opencensus monitoring, some of the data are not passed to exporter. This happens because as one can see in following code, reportUsage() is called only by timer, so when program exists, all data passed to opencensus after last timer firing event are simply lost.

func (w *worker) start() {
	for {
		select {
		case cmd := <-w.c:
			cmd.handleCommand(w)
		case <-w.timer.C:
			w.reportUsage(time.Now())
		case <-w.quit:
			w.timer.Stop()
			close(w.c)
			w.done <- true
			return
		}
	}
}

Solution proposal:

1. Make func (w *worker) stop() to be (indirectly) callable by client of package.
2. Make func (w *worker) start() to call w.reportUsage() before returning when <-w.quit is triggered.