message: Change CHECK to VLOG
  Summary: As in title.
diff: @@ -51,6 +51,8 @@ void processAckFrame(
  folly::Optional<decltype(conn.lossState.lastAckedPacketSentTime)>
  lastAckedPacketSentTime;
  folly::Optional<Observer::SpuriousLossEvent> spuriousLossEvent;
  + // Used for debug only.
  + const auto originalPacketCount = conn.outstandings.packetCount;
  if (conn.observers->size() > 0) {
  spuriousLossEvent.emplace(ackReceiveTime);
  }
  @@ -230,11 +232,23 @@ void processAckFrame(
  CHECK_GE(
  conn.outstandings.packets.size(), conn.outstandings.declaredLostCount);
  auto updatedOustandingPacketsCount = conn.outstandings.numOutstanding();
  - CHECK_GE(
  - updatedOustandingPacketsCount,
  - conn.outstandings.packetCount[PacketNumberSpace::Handshake] +
  - conn.outstandings.packetCount[PacketNumberSpace::Initial] +
  - conn.outstandings.packetCount[PacketNumberSpace::AppData]);
  + const auto& packetCount = conn.outstandings.packetCount;
  + LOG_IF(
  + DFATAL,
  + updatedOustandingPacketsCount <
  + packetCount[PacketNumberSpace::Handshake] +
  + packetCount[PacketNumberSpace::Initial] +
  + packetCount[PacketNumberSpace::AppData])
  + << "QUIC packetCount inconsistency: "
  + "numOutstanding: "
  + << updatedOustandingPacketsCount << " packetCount: {"
  + << packetCount[PacketNumberSpace::Initial] << ","
  + << packetCount[PacketNumberSpace::Handshake] << ","
  + << packetCount[PacketNumberSpace::AppData] << "}"
  + << " originalPacketCount: {"
  + << originalPacketCount[PacketNumberSpace::Initial] << ","
  + << originalPacketCount[PacketNumberSpace::Handshake] << ","
  + << originalPacketCount[PacketNumberSpace::AppData] << "}";
  CHECK_GE(updatedOustandingPacketsCount, conn.outstandings.numClonedPackets());
  auto lossEvent = handleAckForLoss(conn, lossVisitor, ack, pnSpace);
  if (conn.congestionController &&
  