Make scenario results to include start and end time for a test scenario. (#29207)

This commit update the scenario results to include the start_timestamp
and end_timestamp. These two fields are used in prometheus range queries
to indicate the period we are pulling data for.

src/proto/grpc/testing/BUILD

@@ -42,6 +42,7 @@ grpc_proto_library(
     name = "control_proto",
     srcs = ["control.proto"],
     has_services = False,
+    well_known_protos = True,
     deps = [
         "payloads_proto",
         "stats_proto",
@@ -277,6 +278,7 @@ proto_library(
     deps = [
         ":payloads_descriptor",
         ":stats_descriptor",
+        "@com_google_protobuf//:timestamp_proto",
     ],
 )
 

src/proto/grpc/testing/control.proto

@@ -16,6 +16,7 @@ syntax = "proto3";
 
 import "src/proto/grpc/testing/payloads.proto";
 import "src/proto/grpc/testing/stats.proto";
+import "google/protobuf/timestamp.proto";
 
 package grpc.testing;
 
@@ -265,6 +266,11 @@ message ScenarioResultSummary
   // Queries per CPU-sec over all servers or clients
   double server_queries_per_cpu_sec = 17;
   double client_queries_per_cpu_sec = 18;
+
+
+  // Start and end time for the test scenario
+  google.protobuf.Timestamp start_time = 19;
+  google.protobuf.Timestamp end_time =20;
 }
 
 // Results of a single benchmark scenario.

test/cpp/qps/driver.cc

@@ -25,6 +25,8 @@
 #include <unordered_map>
 #include <vector>
 
+#include "google/protobuf/timestamp.pb.h"
+
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
 #include <grpc/support/string_util.h>
@@ -573,6 +575,9 @@ std::unique_ptr<ScenarioResult> RunScenario(
 
   // Start a run
   gpr_log(GPR_INFO, "Starting");
+
+  auto start_time = time(nullptr);
+
   for (size_t i = 0; i < num_servers; i++) {
     auto server = &servers[i];
     if (!server->stream->Write(server_mark)) {
@@ -624,6 +629,8 @@ std::unique_ptr<ScenarioResult> RunScenario(
   bool client_finish_first =
       (client_config.rpc_type() != STREAMING_FROM_SERVER);
 
+  auto end_time = time(nullptr);
+
   FinishClients(clients, client_mark);
 
   if (!client_finish_first) {
@@ -650,6 +657,11 @@ std::unique_ptr<ScenarioResult> RunScenario(
     rrc->set_status_code(it->first);
     rrc->set_count(it->second);
   }
+
+  // Fill in start and end time for the test scenario
+  result->mutable_summary()->mutable_start_time()->set_seconds(start_time);
+  result->mutable_summary()->mutable_end_time()->set_seconds(end_time);
+
   postprocess_scenario_result(result.get());
   return result;
 }