src/cpp/server/load_reporter/load_reporter.cc

   1 /*
   2  *
   3  * Copyright 2018 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #include <grpc/impl/codegen/port_platform.h>
  20
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <chrono>
  24 #include <ctime>
  25 #include <iterator>
  26
  27 #include "src/cpp/server/load_reporter/constants.h"
  28 #include "src/cpp/server/load_reporter/get_cpu_stats.h"
  29 #include "src/cpp/server/load_reporter/load_reporter.h"
  30
  31 #include "opencensus/stats/internal/set_aggregation_window.h"
  32 #include "opencensus/tags/tag_key.h"
  33
  34 namespace grpc {
  35 namespace load_reporter {
  36
  37 CpuStatsProvider::CpuStatsSample CpuStatsProviderDefaultImpl::GetCpuStats() {
  38   return GetCpuStatsImpl();
  39 }
  40
  41 CensusViewProvider::CensusViewProvider()
  42     : tag_key_token_(::opencensus::tags::TagKey::Register(kTagKeyToken)),
  43       tag_key_host_(::opencensus::tags::TagKey::Register(kTagKeyHost)),
  44       tag_key_user_id_(::opencensus::tags::TagKey::Register(kTagKeyUserId)),
  45       tag_key_status_(::opencensus::tags::TagKey::Register(kTagKeyStatus)),
  46       tag_key_metric_name_(
  47           ::opencensus::tags::TagKey::Register(kTagKeyMetricName)) {
  48   // One view related to starting a call.
  49   auto vd_start_count =
  50       ::opencensus::stats::ViewDescriptor()
  51           .set_name(kViewStartCount)
  52           .set_measure(kMeasureStartCount)
  53           .set_aggregation(::opencensus::stats::Aggregation::Sum())
  54           .add_column(tag_key_token_)
  55           .add_column(tag_key_host_)
  56           .add_column(tag_key_user_id_)
  57           .set_description(
  58               "Delta count of calls started broken down by <token, host, "
  59               "user_id>.");
  60   ::opencensus::stats::SetAggregationWindow(
  61       ::opencensus::stats::AggregationWindow::Delta(), &vd_start_count);
  62   view_descriptor_map_.emplace(kViewStartCount, vd_start_count);
  63   // Four views related to ending a call.
  64   // If this view is set as Count of kMeasureEndBytesSent (in hope of saving one
  65   // measure), it's infeasible to prepare fake data for testing. That's because
  66   // the OpenCensus API to make up view data will add the input data as separate
  67   // measurements instead of setting the data values directly.
  68   auto vd_end_count =
  69       ::opencensus::stats::ViewDescriptor()
  70           .set_name(kViewEndCount)
  71           .set_measure(kMeasureEndCount)
  72           .set_aggregation(::opencensus::stats::Aggregation::Sum())
  73           .add_column(tag_key_token_)
  74           .add_column(tag_key_host_)
  75           .add_column(tag_key_user_id_)
  76           .add_column(tag_key_status_)
  77           .set_description(
  78               "Delta count of calls ended broken down by <token, host, "
  79               "user_id, status>.");
  80   ::opencensus::stats::SetAggregationWindow(
  81       ::opencensus::stats::AggregationWindow::Delta(), &vd_end_count);
  82   view_descriptor_map_.emplace(kViewEndCount, vd_end_count);
  83   auto vd_end_bytes_sent =
  84       ::opencensus::stats::ViewDescriptor()
  85           .set_name(kViewEndBytesSent)
  86           .set_measure(kMeasureEndBytesSent)
  87           .set_aggregation(::opencensus::stats::Aggregation::Sum())
  88           .add_column(tag_key_token_)
  89           .add_column(tag_key_host_)
  90           .add_column(tag_key_user_id_)
  91           .add_column(tag_key_status_)
  92           .set_description(
  93               "Delta sum of bytes sent broken down by <token, host, user_id, "
  94               "status>.");
  95   ::opencensus::stats::SetAggregationWindow(
  96       ::opencensus::stats::AggregationWindow::Delta(), &vd_end_bytes_sent);
  97   view_descriptor_map_.emplace(kViewEndBytesSent, vd_end_bytes_sent);
  98   auto vd_end_bytes_received =
  99       ::opencensus::stats::ViewDescriptor()
 100           .set_name(kViewEndBytesReceived)
 101           .set_measure(kMeasureEndBytesReceived)
 102           .set_aggregation(::opencensus::stats::Aggregation::Sum())
 103           .add_column(tag_key_token_)
 104           .add_column(tag_key_host_)
 105           .add_column(tag_key_user_id_)
 106           .add_column(tag_key_status_)
 107           .set_description(
 108               "Delta sum of bytes received broken down by <token, host, "
 109               "user_id, status>.");
 110   ::opencensus::stats::SetAggregationWindow(
 111       ::opencensus::stats::AggregationWindow::Delta(), &vd_end_bytes_received);
 112   view_descriptor_map_.emplace(kViewEndBytesReceived, vd_end_bytes_received);
 113   auto vd_end_latency_ms =
 114       ::opencensus::stats::ViewDescriptor()
 115           .set_name(kViewEndLatencyMs)
 116           .set_measure(kMeasureEndLatencyMs)
 117           .set_aggregation(::opencensus::stats::Aggregation::Sum())
 118           .add_column(tag_key_token_)
 119           .add_column(tag_key_host_)
 120           .add_column(tag_key_user_id_)
 121           .add_column(tag_key_status_)
 122           .set_description(
 123               "Delta sum of latency in ms broken down by <token, host, "
 124               "user_id, status>.");
 125   ::opencensus::stats::SetAggregationWindow(
 126       ::opencensus::stats::AggregationWindow::Delta(), &vd_end_latency_ms);
 127   view_descriptor_map_.emplace(kViewEndLatencyMs, vd_end_latency_ms);
 128   // Two views related to other call metrics.
 129   auto vd_metric_call_count =
 130       ::opencensus::stats::ViewDescriptor()
 131           .set_name(kViewOtherCallMetricCount)
 132           .set_measure(kMeasureOtherCallMetric)
 133           .set_aggregation(::opencensus::stats::Aggregation::Count())
 134           .add_column(tag_key_token_)
 135           .add_column(tag_key_host_)
 136           .add_column(tag_key_user_id_)
 137           .add_column(tag_key_metric_name_)
 138           .set_description(
 139               "Delta count of calls broken down by <token, host, user_id, "
 140               "metric_name>.");
 141   ::opencensus::stats::SetAggregationWindow(
 142       ::opencensus::stats::AggregationWindow::Delta(), &vd_metric_call_count);
 143   view_descriptor_map_.emplace(kViewOtherCallMetricCount, vd_metric_call_count);
 144   auto vd_metric_value =
 145       ::opencensus::stats::ViewDescriptor()
 146           .set_name(kViewOtherCallMetricValue)
 147           .set_measure(kMeasureOtherCallMetric)
 148           .set_aggregation(::opencensus::stats::Aggregation::Sum())
 149           .add_column(tag_key_token_)
 150           .add_column(tag_key_host_)
 151           .add_column(tag_key_user_id_)
 152           .add_column(tag_key_metric_name_)
 153           .set_description(
 154               "Delta sum of call metric value broken down "
 155               "by <token, host, user_id, metric_name>.");
 156   ::opencensus::stats::SetAggregationWindow(
 157       ::opencensus::stats::AggregationWindow::Delta(), &vd_metric_value);
 158   view_descriptor_map_.emplace(kViewOtherCallMetricValue, vd_metric_value);
 159 }
 160
 161 double CensusViewProvider::GetRelatedViewDataRowDouble(
 162     const ViewDataMap& view_data_map, const char* view_name,
 163     size_t view_name_len, const std::vector<std::string>& tag_values) {
 164   auto it_vd = view_data_map.find(std::string(view_name, view_name_len));
 165   GPR_ASSERT(it_vd != view_data_map.end());
 166   GPR_ASSERT(it_vd->second.type() ==
 167              ::opencensus::stats::ViewData::Type::kDouble);
 168   auto it_row = it_vd->second.double_data().find(tag_values);
 169   GPR_ASSERT(it_row != it_vd->second.double_data().end());
 170   return it_row->second;
 171 }
 172
 173 uint64_t CensusViewProvider::GetRelatedViewDataRowInt(
 174     const ViewDataMap& view_data_map, const char* view_name,
 175     size_t view_name_len, const std::vector<std::string>& tag_values) {
 176   auto it_vd = view_data_map.find(std::string(view_name, view_name_len));
 177   GPR_ASSERT(it_vd != view_data_map.end());
 178   GPR_ASSERT(it_vd->second.type() ==
 179              ::opencensus::stats::ViewData::Type::kInt64);
 180   auto it_row = it_vd->second.int_data().find(tag_values);
 181   GPR_ASSERT(it_row != it_vd->second.int_data().end());
 182   GPR_ASSERT(it_row->second >= 0);
 183   return it_row->second;
 184 }
 185
 186 CensusViewProviderDefaultImpl::CensusViewProviderDefaultImpl() {
 187   for (const auto& p : view_descriptor_map()) {
 188     const std::string& view_name = p.first;
 189     const ::opencensus::stats::ViewDescriptor& vd = p.second;
 190     // We need to use pair's piecewise ctor here, otherwise the deleted copy
 191     // ctor of View will be called.
 192     view_map_.emplace(std::piecewise_construct,
 193                       std::forward_as_tuple(view_name),
 194                       std::forward_as_tuple(vd));
 195   }
 196 }
 197
 198 CensusViewProvider::ViewDataMap CensusViewProviderDefaultImpl::FetchViewData() {
 199   gpr_log(GPR_DEBUG, "[CVP %p] Starts fetching Census view data.", this);
 200   ViewDataMap view_data_map;
 201   for (auto& p : view_map_) {
 202     const std::string& view_name = p.first;
 203     ::opencensus::stats::View& view = p.second;
 204     if (view.IsValid()) {
 205       view_data_map.emplace(view_name, view.GetData());
 206       gpr_log(GPR_DEBUG, "[CVP %p] Fetched view data (view: %s).", this,
 207               view_name.c_str());
 208     } else {
 209       gpr_log(
 210           GPR_DEBUG,
 211           "[CVP %p] Can't fetch view data because view is invalid (view: %s).",
 212           this, view_name.c_str());
 213     }
 214   }
 215   return view_data_map;
 216 }
 217
 218 std::string LoadReporter::GenerateLbId() {
 219   while (true) {
 220     if (next_lb_id_ > UINT32_MAX) {
 221       gpr_log(GPR_ERROR, "[LR %p] The LB ID exceeds the max valid value!",
 222               this);
 223       return "";
 224     }
 225     int64_t lb_id = next_lb_id_++;
 226     // Overflow should never happen.
 227     GPR_ASSERT(lb_id >= 0);
 228     // Convert to padded hex string for a 32-bit LB ID. E.g, "0000ca5b".
 229     char buf[kLbIdLength + 1];
 230     snprintf(buf, sizeof(buf), "%08lx", lb_id);
 231     std::string lb_id_str(buf, kLbIdLength);
 232     // The client may send requests with LB ID that has never been allocated
 233     // by this load reporter. Those IDs are tracked and will be skipped when
 234     // we generate a new ID.
 235     if (!load_data_store_.IsTrackedUnknownBalancerId(lb_id_str)) {
 236       return lb_id_str;
 237     }
 238   }
 239 }
 240
 241 ::grpc::lb::v1::LoadBalancingFeedback
 242 LoadReporter::GenerateLoadBalancingFeedback() {
 243   grpc_core::ReleasableMutexLock lock(&feedback_mu_);
 244   auto now = std::chrono::system_clock::now();
 245   // Discard records outside the window until there is only one record
 246   // outside the window, which is used as the base for difference.
 247   while (feedback_records_.size() > 1 &&
 248          !IsRecordInWindow(feedback_records_[1], now)) {
 249     feedback_records_.pop_front();
 250   }
 251   if (feedback_records_.size() < 2) {
 252     return ::grpc::lb::v1::LoadBalancingFeedback::default_instance();
 253   }
 254   // Find the longest range with valid ends.
 255   auto oldest = feedback_records_.begin();
 256   auto newest = feedback_records_.end() - 1;
 257   while (std::distance(oldest, newest) > 0 &&
 258          (newest->cpu_limit == 0 || oldest->cpu_limit == 0)) {
 259     // A zero limit means that the system info reading was failed, so these
 260     // records can't be used to calculate CPU utilization.
 261     if (newest->cpu_limit == 0) --newest;
 262     if (oldest->cpu_limit == 0) ++oldest;
 263   }
 264   if (std::distance(oldest, newest) < 1 ||
 265       oldest->end_time == newest->end_time ||
 266       newest->cpu_limit == oldest->cpu_limit) {
 267     return ::grpc::lb::v1::LoadBalancingFeedback::default_instance();
 268   }
 269   uint64_t rpcs = 0;
 270   uint64_t errors = 0;
 271   for (auto p = newest; p != oldest; --p) {
 272     // Because these two numbers are counters, the oldest record shouldn't be
 273     // included.
 274     rpcs += p->rpcs;
 275     errors += p->errors;
 276   }
 277   double cpu_usage = newest->cpu_usage - oldest->cpu_usage;
 278   double cpu_limit = newest->cpu_limit - oldest->cpu_limit;
 279   std::chrono::duration<double> duration_seconds =
 280       newest->end_time - oldest->end_time;
 281   lock.Unlock();
 282   ::grpc::lb::v1::LoadBalancingFeedback feedback;
 283   feedback.set_server_utilization(static_cast<float>(cpu_usage / cpu_limit));
 284   feedback.set_calls_per_second(
 285       static_cast<float>(rpcs / duration_seconds.count()));
 286   feedback.set_errors_per_second(
 287       static_cast<float>(errors / duration_seconds.count()));
 288   return feedback;
 289 }
 290
 291 ::google::protobuf::RepeatedPtrField<::grpc::lb::v1::Load>
 292 LoadReporter::GenerateLoads(const std::string& hostname,
 293                             const std::string& lb_id) {
 294   grpc_core::MutexLock lock(&store_mu_);
 295   auto assigned_stores = load_data_store_.GetAssignedStores(hostname, lb_id);
 296   GPR_ASSERT(assigned_stores != nullptr);
 297   GPR_ASSERT(!assigned_stores->empty());
 298   ::google::protobuf::RepeatedPtrField<::grpc::lb::v1::Load> loads;
 299   for (PerBalancerStore* per_balancer_store : *assigned_stores) {
 300     GPR_ASSERT(!per_balancer_store->IsSuspended());
 301     if (!per_balancer_store->load_record_map().empty()) {
 302       for (const auto& p : per_balancer_store->load_record_map()) {
 303         const auto& key = p.first;
 304         const auto& value = p.second;
 305         auto load = loads.Add();
 306         load->set_load_balance_tag(key.lb_tag());
 307         load->set_user_id(key.user_id());
 308         load->set_client_ip_address(key.GetClientIpBytes());
 309         load->set_num_calls_started(static_cast<int64_t>(value.start_count()));
 310         load->set_num_calls_finished_without_error(
 311             static_cast<int64_t>(value.ok_count()));
 312         load->set_num_calls_finished_with_error(
 313             static_cast<int64_t>(value.error_count()));
 314         load->set_total_bytes_sent(static_cast<int64_t>(value.bytes_sent()));
 315         load->set_total_bytes_received(
 316             static_cast<int64_t>(value.bytes_recv()));
 317         load->mutable_total_latency()->set_seconds(
 318             static_cast<int64_t>(value.latency_ms() / 1000));
 319         load->mutable_total_latency()->set_nanos(
 320             (static_cast<int32_t>(value.latency_ms()) % 1000) * 1000000);
 321         for (const auto& p : value.call_metrics()) {
 322           const std::string& metric_name = p.first;
 323           const CallMetricValue& metric_value = p.second;
 324           auto call_metric_data = load->add_metric_data();
 325           call_metric_data->set_metric_name(metric_name);
 326           call_metric_data->set_num_calls_finished_with_metric(
 327               metric_value.num_calls());
 328           call_metric_data->set_total_metric_value(
 329               metric_value.total_metric_value());
 330         }
 331         if (per_balancer_store->lb_id() != lb_id) {
 332           // This per-balancer store is an orphan assigned to this receiving
 333           // balancer.
 334           AttachOrphanLoadId(load, *per_balancer_store);
 335         }
 336       }
 337       per_balancer_store->ClearLoadRecordMap();
 338     }
 339     if (per_balancer_store->IsNumCallsInProgressChangedSinceLastReport()) {
 340       auto load = loads.Add();
 341       load->set_num_calls_in_progress(
 342           per_balancer_store->GetNumCallsInProgressForReport());
 343       if (per_balancer_store->lb_id() != lb_id) {
 344         // This per-balancer store is an orphan assigned to this receiving
 345         // balancer.
 346         AttachOrphanLoadId(load, *per_balancer_store);
 347       }
 348     }
 349   }
 350   return loads;
 351 }
 352
 353 void LoadReporter::AttachOrphanLoadId(
 354     ::grpc::lb::v1::Load* load, const PerBalancerStore& per_balancer_store) {
 355   if (per_balancer_store.lb_id() == kInvalidLbId) {
 356     load->set_load_key_unknown(true);
 357   } else {
 358     // We shouldn't set load_key_unknown to any value in this case because
 359     // load_key_unknown and orphaned_load_identifier are under an oneof struct.
 360     load->mutable_orphaned_load_identifier()->set_load_key(
 361         per_balancer_store.load_key());
 362     load->mutable_orphaned_load_identifier()->set_load_balancer_id(
 363         per_balancer_store.lb_id());
 364   }
 365 }
 366
 367 void LoadReporter::AppendNewFeedbackRecord(uint64_t rpcs, uint64_t errors) {
 368   CpuStatsProvider::CpuStatsSample cpu_stats;
 369   if (cpu_stats_provider_ != nullptr) {
 370     cpu_stats = cpu_stats_provider_->GetCpuStats();
 371   } else {
 372     // This will make the load balancing feedback generation a no-op.
 373     cpu_stats = {0, 0};
 374   }
 375   grpc_core::MutexLock lock(&feedback_mu_);
 376   feedback_records_.emplace_back(std::chrono::system_clock::now(), rpcs, errors,
 377                                  cpu_stats.first, cpu_stats.second);
 378 }
 379
 380 void LoadReporter::ReportStreamCreated(const std::string& hostname,
 381                                        const std::string& lb_id,
 382                                        const std::string& load_key) {
 383   grpc_core::MutexLock lock(&store_mu_);
 384   load_data_store_.ReportStreamCreated(hostname, lb_id, load_key);
 385   gpr_log(GPR_INFO,
 386           "[LR %p] Report stream created (host: %s, LB ID: %s, load key: %s).",
 387           this, hostname.c_str(), lb_id.c_str(), load_key.c_str());
 388 }
 389
 390 void LoadReporter::ReportStreamClosed(const std::string& hostname,
 391                                       const std::string& lb_id) {
 392   grpc_core::MutexLock lock(&store_mu_);
 393   load_data_store_.ReportStreamClosed(hostname, lb_id);
 394   gpr_log(GPR_INFO, "[LR %p] Report stream closed (host: %s, LB ID: %s).", this,
 395           hostname.c_str(), lb_id.c_str());
 396 }
 397
 398 void LoadReporter::ProcessViewDataCallStart(
 399     const CensusViewProvider::ViewDataMap& view_data_map) {
 400   auto it = view_data_map.find(kViewStartCount);
 401   if (it != view_data_map.end()) {
 402     for (const auto& p : it->second.int_data()) {
 403       const std::vector<std::string>& tag_values = p.first;
 404       const uint64_t start_count = static_cast<uint64_t>(p.second);
 405       const std::string& client_ip_and_token = tag_values[0];
 406       const std::string& host = tag_values[1];
 407       const std::string& user_id = tag_values[2];
 408       LoadRecordKey key(client_ip_and_token, user_id);
 409       LoadRecordValue value = LoadRecordValue(start_count);
 410       {
 411         grpc_core::MutexLock lock(&store_mu_);
 412         load_data_store_.MergeRow(host, key, value);
 413       }
 414     }
 415   }
 416 }
 417
 418 void LoadReporter::ProcessViewDataCallEnd(
 419     const CensusViewProvider::ViewDataMap& view_data_map) {
 420   uint64_t total_end_count = 0;
 421   uint64_t total_error_count = 0;
 422   auto it = view_data_map.find(kViewEndCount);
 423   if (it != view_data_map.end()) {
 424     for (const auto& p : it->second.int_data()) {
 425       const std::vector<std::string>& tag_values = p.first;
 426       const uint64_t end_count = static_cast<uint64_t>(p.second);
 427       const std::string& client_ip_and_token = tag_values[0];
 428       const std::string& host = tag_values[1];
 429       const std::string& user_id = tag_values[2];
 430       const std::string& status = tag_values[3];
 431       // This is due to a bug reported internally of Java server load reporting
 432       // implementation.
 433       // TODO(juanlishen): Check whether this situation happens in OSS C++.
 434       if (client_ip_and_token.size() == 0) {
 435         gpr_log(GPR_DEBUG,
 436                 "Skipping processing Opencensus record with empty "
 437                 "client_ip_and_token tag.");
 438         continue;
 439       }
 440       LoadRecordKey key(client_ip_and_token, user_id);
 441       const uint64_t bytes_sent = CensusViewProvider::GetRelatedViewDataRowInt(
 442           view_data_map, kViewEndBytesSent, sizeof(kViewEndBytesSent) - 1,
 443           tag_values);
 444       const uint64_t bytes_received =
 445           CensusViewProvider::GetRelatedViewDataRowInt(
 446               view_data_map, kViewEndBytesReceived,
 447               sizeof(kViewEndBytesReceived) - 1, tag_values);
 448       const uint64_t latency_ms = CensusViewProvider::GetRelatedViewDataRowInt(
 449           view_data_map, kViewEndLatencyMs, sizeof(kViewEndLatencyMs) - 1,
 450           tag_values);
 451       uint64_t ok_count = 0;
 452       uint64_t error_count = 0;
 453       total_end_count += end_count;
 454       if (std::strcmp(status.c_str(), kCallStatusOk) == 0) {
 455         ok_count = end_count;
 456       } else {
 457         error_count = end_count;
 458         total_error_count += end_count;
 459       }
 460       LoadRecordValue value = LoadRecordValue(
 461           0, ok_count, error_count, bytes_sent, bytes_received, latency_ms);
 462       {
 463         grpc_core::MutexLock lock(&store_mu_);
 464         load_data_store_.MergeRow(host, key, value);
 465       }
 466     }
 467   }
 468   AppendNewFeedbackRecord(total_end_count, total_error_count);
 469 }
 470
 471 void LoadReporter::ProcessViewDataOtherCallMetrics(
 472     const CensusViewProvider::ViewDataMap& view_data_map) {
 473   auto it = view_data_map.find(kViewOtherCallMetricCount);
 474   if (it != view_data_map.end()) {
 475     for (const auto& p : it->second.int_data()) {
 476       const std::vector<std::string>& tag_values = p.first;
 477       const int64_t num_calls = p.second;
 478       const std::string& client_ip_and_token = tag_values[0];
 479       const std::string& host = tag_values[1];
 480       const std::string& user_id = tag_values[2];
 481       const std::string& metric_name = tag_values[3];
 482       LoadRecordKey key(client_ip_and_token, user_id);
 483       const double total_metric_value =
 484           CensusViewProvider::GetRelatedViewDataRowDouble(
 485               view_data_map, kViewOtherCallMetricValue,
 486               sizeof(kViewOtherCallMetricValue) - 1, tag_values);
 487       LoadRecordValue value = LoadRecordValue(
 488           metric_name, static_cast<uint64_t>(num_calls), total_metric_value);
 489       {
 490         grpc_core::MutexLock lock(&store_mu_);
 491         load_data_store_.MergeRow(host, key, value);
 492       }
 493     }
 494   }
 495 }
 496
 497 void LoadReporter::FetchAndSample() {
 498   gpr_log(GPR_DEBUG,
 499           "[LR %p] Starts fetching Census view data and sampling LB feedback "
 500           "record.",
 501           this);
 502   CensusViewProvider::ViewDataMap view_data_map =
 503       census_view_provider_->FetchViewData();
 504   ProcessViewDataCallStart(view_data_map);
 505   ProcessViewDataCallEnd(view_data_map);
 506   ProcessViewDataOtherCallMetrics(view_data_map);
 507 }
 508
 509 }  // namespace load_reporter
 510 }  // namespace grpc