void awaitBlobDeletions(String blobId) {
    try {
      waitForTracker(blobId);
      if (!objectTracker.get(blobId).awaitBlobDeletions()) {
        Assert.fail("Failed awaiting for " + blobId + " deletions");
      }
    } catch (InterruptedException e) {
      // ignore
    }
  }
Waits for blob deletions on all replicas for {@code blobId}
@param blobId the ID of the blob
ambry-test-utils/src/main/java/com/github/ambry/server/MockNotificationSystem.java