We fond there will be race while registering metric in multithread and process crash finally.
According to opencensus source code, it's known issue but not fixed yet.

void StatsManager::ViewInformation::AddConsumer() {
  mu_->AssertHeld();
  ++num_consumers_;
}

int StatsManager::ViewInformation::RemoveConsumer() {
  mu_->AssertHeld();
  return --num_consumers_;
}

  // TODO: PERF: Global synchronization is only needed for adding or
  // removing measures--we can reduce recording contention by claiming a reader
  // lock on mu_ and a writer lock on a measure-specific mutex.
  mutable absl::Mutex mu_;

So we'd better add lock for registering metric when first recording.

Why are these changes needed?

Related issue number

#13484

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