Add UMA for tracking which BWE versions are in use.

webrtc/modules/congestion_controller/delay_based_bwe.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/modules/congestion_controller/delay_based_bwe.h"
 
 #include <math.h>
 
 #include <algorithm>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/thread_annotations.h"
 #include "webrtc/modules/pacing/paced_sender.h"
 #include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
+#include "webrtc/system_wrappers/include/metrics.h"
 #include "webrtc/typedefs.h"
 
 namespace {
 enum {
   kTimestampGroupLengthMs = 5,
   kAbsSendTimeFraction = 18,
   kAbsSendTimeInterArrivalUpshift = 8,
   kInterArrivalShift = kAbsSendTimeFraction + kAbsSendTimeInterArrivalUpshift,
   kInitialProbingIntervalMs = 2000,
   kMinClusterSize = 4,
@@ skipping 37 matching lines @@
 DelayBasedBwe::DelayBasedBwe(RemoteBitrateObserver* observer, Clock* clock)
     : clock_(clock),
       observer_(observer),
       inter_arrival_(),
       estimator_(),
       detector_(OverUseDetectorOptions()),
       incoming_bitrate_(kBitrateWindowMs, 8000),
       total_probes_received_(0),
       first_packet_time_ms_(-1),
       last_update_ms_(-1),
-      ssrcs_() {
+      uma_recorded_(false) {
   RTC_DCHECK(observer_);
   // NOTE! The BitrateEstimatorTest relies on this EXACT log line.
   LOG(LS_INFO) << "RemoteBitrateEstimatorAbsSendTime: Instantiating.";
   network_thread_.DetachFromThread();
 }
 
 void DelayBasedBwe::ComputeClusters(std::list<Cluster>* clusters) const {
   Cluster current;
   int64_t prev_send_time = -1;
   int64_t prev_recv_time = -1;
@@ skipping 97 matching lines @@
   bool initial_probe = !remote_rate_.ValidEstimate() && new_bitrate_bps > 0;
   bool bitrate_above_estimate =
       remote_rate_.ValidEstimate() &&
       new_bitrate_bps > static_cast<int>(remote_rate_.LatestEstimate());
   return initial_probe || bitrate_above_estimate;
 }
 
 void DelayBasedBwe::IncomingPacketFeedbackVector(
     const std::vector<PacketInfo>& packet_feedback_vector) {
   RTC_DCHECK(network_thread_.CalledOnValidThread());
+  if (!uma_recorded_) {
+    RTC_LOGGED_HISTOGRAM_ENUMERATION(kBweTypeHistogram,
+                                     BweNames::kSendSideTransportSeqNum,
+                                     BweNames::kBweNamesMax);
+    uma_recorded_ = true;
+  }
   for (const auto& packet_info : packet_feedback_vector) {
     IncomingPacketInfo(packet_info.arrival_time_ms,
                        ConvertMsTo24Bits(packet_info.send_time_ms),
                        packet_info.payload_size, 0,
                        packet_info.probe_cluster_id);
   }
 }
 
 void DelayBasedBwe::IncomingPacketInfo(int64_t arrival_time_ms,
                                        uint32_t send_time_24bits,
@@ skipping 158 matching lines @@
   return true;
 }
 
 void DelayBasedBwe::SetMinBitrate(int min_bitrate_bps) {
   // Called from both the configuration thread and the network thread. Shouldn't
   // be called from the network thread in the future.
   rtc::CritScope lock(&crit_);
   remote_rate_.SetMinBitrate(min_bitrate_bps);
 }
 }  // namespace webrtc