Fix prometheusreceiver context, avoid using start context (#2737)

Signed-off-by: Bogdan Drutu <[email protected]>

receiver/prometheusreceiver/metrics_receiver.go

@@ -76,7 +76,9 @@ func (r *pReceiver) Start(ctx context.Context, host component.Host) error {
  if !r.cfg.UseStartTimeMetric {
  jobsMap = internal.NewJobsMap(2 * time.Minute)
  }
- receiverCtx := obsreport.ReceiverContext(ctx, r.cfg.Name(), transport)
+ // Per component.Component Start instructions, for async operations we should not use the
+ // incoming context, it may get cancelled.
+ receiverCtx := obsreport.ReceiverContext(context.Background(), r.cfg.Name(), transport)
  ocaStore := internal.NewOcaStore(receiverCtx, r.consumer, r.logger, jobsMap, r.cfg.UseStartTimeMetric, r.cfg.StartTimeMetricRegex, r.cfg.Name())
 
  scrapeManager := scrape.NewManager(logger, ocaStore)