c.sourcesLock.Lock()
	defer c.sourcesLock.Unlock()
	c.sources.Insert(source)
	return c.mux.ChannelWithContext(ctx, source)
}

// SeenAllSources returns true if seenSources contains all sources in the
// config, and also this config has received a SET message from each source.
func (c *PodConfig) SeenAllSources(seenSources sets.Set[string]) bool {
	if c.pods == nil {
		return false
	}
	c.sourcesLock.Lock()
	defer c.sourcesLock.Unlock()

		defer cancel()
		defer wg.Done()
		for i := 0; i < iterations; i++ {
			config.Channel(ctx, strconv.Itoa(i))
		}
	}()
	go func() {
		defer wg.Done()
		for i := 0; i < iterations; i++ {
			config.SeenAllSources(seenSources)
		}
	}()

	wg.Wait()