cv: introduce actual start time field in attempt bq table

R=aravindvasudev@google.com, ddoman

Bug: 326496693
Change-Id: Ibd739d943599a9b7fc65bf8b98e897eb366658a4
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/5318700
Commit-Queue: Yiwei Zhang <yiwzhang@google.com>
Reviewed-by: Scott Lee <ddoman@chromium.org>
Auto-Submit: Yiwei Zhang <yiwzhang@google.com>
Reviewed-by: Aravind Vasudevan <aravindvasudev@google.com>
diff --git a/cv/api/bigquery/v1/attempt.pb.go b/cv/api/bigquery/v1/attempt.pb.go
index 7587ce6..cce7bb0 100644
--- a/cv/api/bigquery/v1/attempt.pb.go
+++ b/cv/api/bigquery/v1/attempt.pb.go
@@ -14,7 +14,7 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.31.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v3.21.7
 // source: go.chromium.org/luci/cv/api/bigquery/v1/attempt.proto
 
@@ -369,7 +369,7 @@
 // An attempt involves doing checks for one or more CLs that could
 // potentially be submitted together.
 //
-// Next ID: 13.
+// Next ID: 14.
 type Attempt struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -395,6 +395,13 @@
 	EquivalentClGroupKey string `protobuf:"bytes,4,opt,name=equivalent_cl_group_key,json=equivalentClGroupKey,proto3" json:"equivalent_cl_group_key,omitempty"`
 	// The time when the Attempt started (trigger time of the last CL triggered).
 	StartTime *timestamppb.Timestamp `protobuf:"bytes,5,opt,name=start_time,json=startTime,proto3" json:"start_time,omitempty"`
+	// The time when the Attempt started in LUCI CV.
+	//
+	// In most cases, this should be very close to `start_time` as it only
+	// involves the processing delay of the CL. However, if the run can not be
+	// started immediately due to user running out of quota, then there could be
+	// a gap between `actual_start_time` and `start_time`.
+	ActualStartTime *timestamppb.Timestamp `protobuf:"bytes,13,opt,name=actual_start_time,json=actualStartTime,proto3" json:"actual_start_time,omitempty"`
 	// The time when the Attempt ended (released by CQ).
 	EndTime *timestamppb.Timestamp `protobuf:"bytes,6,opt,name=end_time,json=endTime,proto3" json:"end_time,omitempty"`
 	// Gerrit changes, with specific patchsets, in this Attempt.
@@ -498,6 +505,13 @@
 	return nil
 }
 
+func (x *Attempt) GetActualStartTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.ActualStartTime
+	}
+	return nil
+}
+
 func (x *Attempt) GetEndTime() *timestamppb.Timestamp {
 	if x != nil {
 		return x.EndTime
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 }
 
 var (
@@ -913,20 +932,21 @@
 }
 var file_go_chromium_org_luci_cv_api_bigquery_v1_attempt_proto_depIdxs = []int32{
 	8,  // 0: bigquery.Attempt.start_time:type_name -> google.protobuf.Timestamp
-	8,  // 1: bigquery.Attempt.end_time:type_name -> google.protobuf.Timestamp
-	6,  // 2: bigquery.Attempt.gerrit_changes:type_name -> bigquery.GerritChange
-	7,  // 3: bigquery.Attempt.builds:type_name -> bigquery.Build
-	1,  // 4: bigquery.Attempt.status:type_name -> bigquery.AttemptStatus
-	2,  // 5: bigquery.Attempt.substatus:type_name -> bigquery.AttemptSubstatus
-	8,  // 6: bigquery.GerritChange.trigger_time:type_name -> google.protobuf.Timestamp
-	0,  // 7: bigquery.GerritChange.mode:type_name -> bigquery.Mode
-	3,  // 8: bigquery.GerritChange.submit_status:type_name -> bigquery.GerritChange.SubmitStatus
-	4,  // 9: bigquery.Build.origin:type_name -> bigquery.Build.Origin
-	10, // [10:10] is the sub-list for method output_type
-	10, // [10:10] is the sub-list for method input_type
-	10, // [10:10] is the sub-list for extension type_name
-	10, // [10:10] is the sub-list for extension extendee
-	0,  // [0:10] is the sub-list for field type_name
+	8,  // 1: bigquery.Attempt.actual_start_time:type_name -> google.protobuf.Timestamp
+	8,  // 2: bigquery.Attempt.end_time:type_name -> google.protobuf.Timestamp
+	6,  // 3: bigquery.Attempt.gerrit_changes:type_name -> bigquery.GerritChange
+	7,  // 4: bigquery.Attempt.builds:type_name -> bigquery.Build
+	1,  // 5: bigquery.Attempt.status:type_name -> bigquery.AttemptStatus
+	2,  // 6: bigquery.Attempt.substatus:type_name -> bigquery.AttemptSubstatus
+	8,  // 7: bigquery.GerritChange.trigger_time:type_name -> google.protobuf.Timestamp
+	0,  // 8: bigquery.GerritChange.mode:type_name -> bigquery.Mode
+	3,  // 9: bigquery.GerritChange.submit_status:type_name -> bigquery.GerritChange.SubmitStatus
+	4,  // 10: bigquery.Build.origin:type_name -> bigquery.Build.Origin
+	11, // [11:11] is the sub-list for method output_type
+	11, // [11:11] is the sub-list for method input_type
+	11, // [11:11] is the sub-list for extension type_name
+	11, // [11:11] is the sub-list for extension extendee
+	0,  // [0:11] is the sub-list for field type_name
 }
 
 func init() { file_go_chromium_org_luci_cv_api_bigquery_v1_attempt_proto_init() }
diff --git a/cv/api/bigquery/v1/attempt.proto b/cv/api/bigquery/v1/attempt.proto
index 952eeb9..c0fde7f 100644
--- a/cv/api/bigquery/v1/attempt.proto
+++ b/cv/api/bigquery/v1/attempt.proto
@@ -26,7 +26,7 @@
 // An attempt involves doing checks for one or more CLs that could
 // potentially be submitted together.
 //
-// Next ID: 13.
+// Next ID: 14.
 message Attempt {
   // The opaque key unique to this Attempt.
   string key = 1;
@@ -48,8 +48,20 @@
   // same.
   string equivalent_cl_group_key = 4;
 
-  // The time when the Attempt started (trigger time of the last CL triggered).
+  // The time when the Attempt started.
+  //
+  // Note: this is the trigger time of the last CL triggered (i.e. the time
+  // user votes CQ+1 or +2) not the time LUCI CV started the run. Ideally, this
+  // should be named `create_time` and `actual_start_time` should be named
+  // `start_time`.
   google.protobuf.Timestamp start_time = 5;
+  // The time when the Attempt actually started in LUCI CV.
+  //
+  // In most cases, this should be very close to `start_time` as it only
+  // involves the overhead of LUCI CV getting data from Gerrit. However, if the
+  // run can not be started immediately due to user running out of quota, then
+  // there could be a gap between `actual_start_time` and `start_time`.
+  google.protobuf.Timestamp actual_start_time = 13;
   // The time when the Attempt ended (released by CQ).
   google.protobuf.Timestamp end_time = 6;