Repository: kubeflow/pipelines (language: python)

Issue:
[feature] Allow the ability to sort Experiments by "last run creation" 
### Feature Area


/area frontend
/area backend


### What feature would you like to see?

When experiments list get's rather long, would be very useful to be able to sort the experiments by "last run creation date": 

In the UI this would result in the user being able to click the "Last 5 runs" column header, and sort by this. Thus also getting rid of the "Cannot sort by this column" mouseover message. 

![image](https://github.com/kubeflow/pipelines/assets/10904967/4d24154a-1728-4bcb-b70b-e64b28828c87)

Note that this field does not currently exist in the backend api, and would need to be added. This would result in a new column on the Experiments table for which we could sort this field by. This field would need to be updated everytime a run is created, this means when: 

* a single run is manually created
* when a scheduled run is triggered


### What is the use case or pain point?

It is hard to find experiments that have had a recent run because we cannot sort by this field.

### Is there a workaround currently?

No

---

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Discussion / hints:

Fix patch:
diff --git a/backend/api/v2beta1/experiment.proto b/backend/api/v2beta1/experiment.proto
index 78c9dfd9d05..9e4a13f5007 100644
--- a/backend/api/v2beta1/experiment.proto
+++ b/backend/api/v2beta1/experiment.proto
@@ -104,6 +104,9 @@ message Experiment {
 
   // Output. Specifies whether this experiment is in archived or available state.
   StorageState storage_state = 6;
+
+  // Output. The creation time of the last run in this experiment.
+  google.protobuf.Timestamp last_run_created_at = 7;
 }
 
 message CreateExperimentRequest {
diff --git a/backend/api/v2beta1/go_client/experiment.pb.go b/backend/api/v2beta1/go_client/experiment.pb.go
index 7f2a755a81d..5b4e0a34e57 100644
--- a/backend/api/v2beta1/go_client/experiment.pb.go
+++ b/backend/api/v2beta1/go_client/experiment.pb.go
@@ -112,6 +112,8 @@ type Experiment struct {
 	Namespace string `protobuf:"bytes,5,opt,name=namespace,proto3" json:"namespace,omitempty"`
 	// Output. Specifies whether this experiment is in archived or available state.
 	StorageState Experiment_StorageState `protobuf:"varint,6,opt,name=storage_state,json=storageState,proto3,enum=kubeflow.pipelines.backend.api.v2beta1.Experiment_StorageState" json:"storage_state,omitempty"`
+	// Output. The time the created time of the last run in this experiment.
+	LastRunCreatedAt *timestamppb.Timestamp `protobuf:"bytes,7,opt,name=last_run_created_at,json=lastRunCreatedAt,proto3" json:"last_run_created_at,omitempty"`
 }
 
 func (x *Experiment) Reset() {
@@ -188,6 +190,13 @@ func (x *Experiment) GetStorageState() Experiment_StorageState {
 	return Experiment_STORAGE_STATE_UNSPECIFIED
 }
 
+func (x *Experiment) GetLastRunCreatedAt() *timestamppb.Timestamp {
+	if x != nil {
+		return x.LastRunCreatedAt
+	}
+	return nil
+}
+
 type CreateExperimentRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -597,152 +606,153 @@ var file_backend_api_v2beta1_experiment_proto_rawDesc = []byte{
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 }
 
 var (
@@ -775,25 +785,26 @@ var file_backend_api_v2beta1_experiment_proto_goTypes = []interface{}{
 var file_backend_api_v2beta1_experiment_proto_depIdxs = []int32{
 	9,  // 0: kubeflow.pipelines.backend.api.v2beta1.Experiment.created_at:type_name -> google.protobuf.Timestamp
 	0,  // 1: kubeflow.pipelines.backend.api.v2beta1.Experiment.storage_state:type_name -> kubeflow.pipelines.backend.api.v2beta1.Experiment.StorageState
-	1,  // 2: kubeflow.pipelines.backend.api.v2beta1.CreateExperimentRequest.experiment:type_name -> kubeflow.pipelines.backend.api.v2beta1.Experiment
-	1,  // 3: kubeflow.pipelines.backend.api.v2beta1.ListExperimentsResponse.experiments:type_name -> kubeflow.pipelines.backend.api.v2beta1.Experiment
-	2,  // 4: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.CreateExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.CreateExperimentRequest
-	3,  // 5: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.GetExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.GetExperimentRequest
-	4,  // 6: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ListExperiments:input_type -> kubeflow.pipelines.backend.api.v2beta1.ListExperimentsRequest
-	7,  // 7: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ArchiveExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.ArchiveExperimentRequest
-	8,  // 8: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.UnarchiveExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.UnarchiveExperimentRequest
-	6,  // 9: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.DeleteExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.DeleteExperimentRequest
-	1,  // 10: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.CreateExperiment:output_type -> kubeflow.pipelines.backend.api.v2beta1.Experiment
-	1,  // 11: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.GetExperiment:output_type -> kubeflow.pipelines.backend.api.v2beta1.Experiment
-	5,  // 12: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ListExperiments:output_type -> kubeflow.pipelines.backend.api.v2beta1.ListExperimentsResponse
-	10, // 13: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ArchiveExperiment:output_type -> google.protobuf.Empty
-	10, // 14: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.UnarchiveExperiment:output_type -> google.protobuf.Empty
-	10, // 15: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.DeleteExperiment:output_type -> google.protobuf.Empty
-	10, // [10:16] is the sub-list for method output_type
-	4,  // [4:10] is the sub-list for method input_type
-	4,  // [4:4] is the sub-list for extension type_name
-	4,  // [4:4] is the sub-list for extension extendee
-	0,  // [0:4] is the sub-list for field type_name
+	9,  // 2: kubeflow.pipelines.backend.api.v2beta1.Experiment.last_run_created_at:type_name -> google.protobuf.Timestamp
+	1,  // 3: kubeflow.pipelines.backend.api.v2beta1.CreateExperimentRequest.experiment:type_name -> kubeflow.pipelines.backend.api.v2beta1.Experiment
+	1,  // 4: kubeflow.pipelines.backend.api.v2beta1.ListExperimentsResponse.experiments:type_name -> kubeflow.pipelines.backend.api.v2beta1.Experiment
+	2,  // 5: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.CreateExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.CreateExperimentRequest
+	3,  // 6: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.GetExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.GetExperimentRequest
+	4,  // 7: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ListExperiments:input_type -> kubeflow.pipelines.backend.api.v2beta1.ListExperimentsRequest
+	7,  // 8: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ArchiveExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.ArchiveExperimentRequest
+	8,  // 9: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.UnarchiveExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.UnarchiveExperimentRequest
+	6,  // 10: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.DeleteExperiment:input_type -> kubeflow.pipelines.backend.api.v2beta1.DeleteExperimentRequest
+	1,  // 11: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.CreateExperiment:output_type -> kubeflow.pipelines.backend.api.v2beta1.Experiment
+	1,  // 12: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.GetExperiment:output_type -> kubeflow.pipelines.backend.api.v2beta1.Experiment
+	5,  // 13: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ListExperiments:output_type -> kubeflow.pipelines.backend.api.v2beta1.ListExperimentsResponse
+	10, // 14: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.ArchiveExperiment:output_type -> google.protobuf.Empty
+	10, // 15: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.UnarchiveExperiment:output_type -> google.protobuf.Empty
+	10, // 16: kubeflow.pipelines.backend.api.v2beta1.ExperimentService.DeleteExperiment:output_type -> google.protobuf.Empty
+	11, // [11:17] is the sub-list for method output_type
+	5,  // [5:11] is the sub-list for method input_type
+	5,  // [5:5] is the sub-list for extension type_name
+	5,  // [5:5] is the sub-list for extension extendee
+	0,  // [0:5] is the sub-list for field type_name
 }
 
 func init() { file_backend_api_v2beta1_experiment_proto_init() }
diff --git a/backend/api/v2beta1/go_http_client/experiment_model/v2beta1_experiment.go b/backend/api/v2beta1/go_http_client/experiment_model/v2beta1_experiment.go
index 6525c4160a7..e87c02f8e6e 100644
--- a/backend/api/v2beta1/go_http_client/experiment_model/v2beta1_experiment.go
+++ b/backend/api/v2beta1/go_http_client/experiment_model/v2beta1_experiment.go
@@ -30,6 +30,10 @@ type V2beta1Experiment struct {
 	// Output. Unique experiment ID. Generated by API server.
 	ExperimentID string `json:"experiment_id,omitempty"`
 
+	// Output. The time the created time of the last run in this experiment.
+	// Format: date-time
+	LastRunCreatedAt strfmt.DateTime `json:"last_run_created_at,omitempty"`
+
 	// Optional input field. Specify the namespace this experiment belongs to.
 	Namespace string `json:"namespace,omitempty"`
 
@@ -45,6 +49,10 @@ func (m *V2beta1Experiment) Validate(formats strfmt.Registry) error {
 		res = append(res, err)
 	}
 
+	if err := m.validateLastRunCreatedAt(formats); err != nil {
+		res = append(res, err)
+	}
+
 	if err := m.validateStorageState(formats); err != nil {
 		res = append(res, err)
 	}
@@ -68,6 +76,19 @@ func (m *V2beta1Experiment) validateCreatedAt(formats strfmt.Registry) error {
 	return nil
 }
 
+func (m *V2beta1Experiment) validateLastRunCreatedAt(formats strfmt.Registry) error {
+
+	if swag.IsZero(m.LastRunCreatedAt) { // not required
+		return nil
+	}
+
+	if err := validate.FormatOf("last_run_created_at", "body", "date-time", m.LastRunCreatedAt.String(), formats); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (m *V2beta1Experiment) validateStorageState(formats strfmt.Registry) error {
 
 	if swag.IsZero(m.StorageState) { // not required
diff --git a/backend/api/v2beta1/swagger/experiment.swagger.json b/backend/api/v2beta1/swagger/experiment.swagger.json
index 55d0db46263..a77eaa91104 100644
--- a/backend/api/v2beta1/swagger/experiment.swagger.json
+++ b/backend/api/v2beta1/swagger/experiment.swagger.json
@@ -299,6 +299,11 @@
         "storage_state": {
           "$ref": "#/definitions/v2beta1ExperimentStorageState",
           "description": "Output. Specifies whether this experiment is in archived or available state."
+        },
+        "last_run_created_at": {
+          "type": "string",
+          "format": "date-time",
+          "description": "Output. The time the created time of the last run in this experiment."
         }
       }
     },
diff --git a/backend/api/v2beta1/swagger/kfp_api_single_file.swagger.json b/backend/api/v2beta1/swagger/kfp_api_single_file.swagger.json
index 3c31bbe6e03..85e5023454c 100644
--- a/backend/api/v2beta1/swagger/kfp_api_single_file.swagger.json
+++ b/backend/api/v2beta1/swagger/kfp_api_single_file.swagger.json
@@ -1613,6 +1613,11 @@
         "storage_state": {
           "$ref": "#/definitions/v2beta1ExperimentStorageState",
           "description": "Output. Specifies whether this experiment is in archived or available state."
+        },
+        "last_run_created_at": {
+          "type": "string",
+          "format": "date-time",
+          "description": "Output. The time the created time of the last run in this experiment."
         }
       }
     },
diff --git a/backend/src/apiserver/model/experiment.go b/backend/src/apiserver/model/experiment.go
index 950ca66e11b..0adde8e8f42 100644
--- a/backend/src/apiserver/model/experiment.go
+++ b/backend/src/apiserver/model/experiment.go
@@ -15,12 +15,13 @@
 package model
 
 type Experiment struct {
-	UUID           string       `gorm:"column:UUID; not null; primary_key;"`
-	Name           string       `gorm:"column:Name; not null; unique_index:idx_name_namespace;"`
-	Description    string       `gorm:"column:Description; not null;"`
-	CreatedAtInSec int64        `gorm:"column:CreatedAtInSec; not null;"`
-	Namespace      string       `gorm:"column:Namespace; not null; unique_index:idx_name_namespace;"`
-	StorageState   StorageState `gorm:"column:StorageState; not null;"`
+	UUID                  string       `gorm:"column:UUID; not null; primary_key;"`
+	Name                  string       `gorm:"column:Name; not null; unique_index:idx_name_namespace;"`
+	Description           string       `gorm:"column:Description; not null;"`
+	CreatedAtInSec        int64        `gorm:"column:CreatedAtInSec; not null;"`
+	LastRunCreatedAtInSec int64        `gorm:"column:LastRunCreatedAtInSec; not null;"`
+	Namespace             string       `gorm:"column:Namespace; not null; unique_index:idx_name_namespace;"`
+	StorageState          StorageState `gorm:"column:StorageState; not null;"`
 }
 
 // Note: Experiment.StorageState can have values: "STORAGE_STATE_UNSPECIFIED", "AVAILABLE" or "ARCHIVED"
@@ -44,14 +45,15 @@ func (e *Experiment) DefaultSortField() string {
 }
 
 var experimentAPIToModelFieldMap = map[string]string{
-	"id":            "UUID", // v1beta1 API
-	"experiment_id": "UUID", // v2beta1 API
-	"name":          "Name", // v1beta1 API
-	"display_name":  "Name", // v2beta1 API
-	"created_at":    "CreatedAtInSec",
-	"description":   "Description",
-	"namespace":     "Namespace", // v2beta1 API
-	"storage_state": "StorageState",
+	"id":                  "UUID", // v1beta1 API
+	"experiment_id":       "UUID", // v2beta1 API
+	"name":                "Name", // v1beta1 API
+	"display_name":        "Name", // v2beta1 API
+	"created_at":          "CreatedAtInSec",
+	"last_run_created_at": "LastRunCreatedAtInSec", // v2beta1 API
+	"description":         "Description",
+	"namespace":           "Namespace", // v2beta1 API
+	"storage_state":       "StorageState",
 }
 
 // APIToModelFieldMap returns a map from API names to field names for model
@@ -80,6 +82,8 @@ func (e *Experiment) GetFieldValue(name string) interface{} {
 		return e.Name
 	case "CreatedAtInSec":
 		return e.CreatedAtInSec
+	case "LastRunCreatedAtInSec":
+		return e.LastRunCreatedAtInSec
 	case "Description":
 		return e.Description
 	case "Namespace":
diff --git a/backend/src/apiserver/resource/resource_manager.go b/backend/src/apiserver/resource/resource_manager.go
index b328f70db99..d78b2c2d0e3 100644
--- a/backend/src/apiserver/resource/resource_manager.go
+++ b/backend/src/apiserver/resource/resource_manager.go
@@ -564,6 +564,13 @@ func (r *ResourceManager) CreateRun(ctx context.Context, run *model.Run) (*model
 	if err != nil {
 		return nil, util.Wrap(err, "Failed to create a run")
 	}
+
+	// Upon run creation, update owning experiment
+	err = r.experimentStore.SetLastRunTimestamp(newRun)
+	if err != nil {
+		return nil, util.Wrap(err, fmt.Sprintf("Failed to set last run timestamp on experiment %s for run %s", newRun.ExperimentId, newRun.UUID))
+	}
+
 	return newRun, nil
 }
 
@@ -1245,6 +1252,10 @@ func (r *ResourceManager) ReportWorkflowResource(ctx context.Context, execSpec u
 		} else {
 			runId = run.UUID
 		}
+		// Upon run creation, update owning experiment
+		if updateError = r.experimentStore.SetLastRunTimestamp(run); updateError != nil {
+			return nil, util.Wrapf(updateError, "Failed to report a workflow for existing run %s during updating the owning experiment.", runId)
+		}
 	}
 	if execStatus.IsInFinalState() {
 		err := addWorkflowLabel(ctx, r.getWorkflowClient(execSpec.ExecutionNamespace()), execSpec.ExecutionName(), util.LabelKeyWorkflowPersistedFinalState, "true")
diff --git a/backend/src/apiserver/server/api_converter.go b/backend/src/apiserver/server/api_converter.go
index 1bbe6d34f1f..4db790a7e0b 100644
--- a/backend/src/apiserver/server/api_converter.go
+++ b/backend/src/apiserver/server/api_converter.go
@@ -113,12 +113,13 @@ func toApiExperiment(experiment *model.Experiment) *apiv2beta1.Experiment {
 		storageState = apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["STORAGE_STATE_UNSPECIFIED"])
 	}
 	return &apiv2beta1.Experiment{
-		ExperimentId: experiment.UUID,
-		DisplayName:  experiment.Name,
-		Description:  experiment.Description,
-		CreatedAt:    &timestamp.Timestamp{Seconds: experiment.CreatedAtInSec},
-		Namespace:    experiment.Namespace,
-		StorageState: storageState,
+		ExperimentId:     experiment.UUID,
+		DisplayName:      experiment.Name,
+		Description:      experiment.Description,
+		CreatedAt:        &timestamp.Timestamp{Seconds: experiment.CreatedAtInSec},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: experiment.LastRunCreatedAtInSec},
+		Namespace:        experiment.Namespace,
+		StorageState:     storageState,
 	}
 }
 
diff --git a/backend/src/apiserver/storage/experiment_store.go b/backend/src/apiserver/storage/experiment_store.go
index febfa8b2d05..d72680893d8 100644
--- a/backend/src/apiserver/storage/experiment_store.go
+++ b/backend/src/apiserver/storage/experiment_store.go
@@ -33,6 +33,7 @@ type ExperimentStoreInterface interface {
 	ArchiveExperiment(expId string) error
 	UnarchiveExperiment(expId string) error
 	DeleteExperiment(uuid string) error
+	SetLastRunTimestamp(run *model.Run) error
 }
 
 type ExperimentStore struct {
@@ -48,6 +49,7 @@ var experimentColumns = []string{
 	"Name",
 	"Description",
 	"CreatedAtInSec",
+	"LastRunCreatedAtInSec",
 	"Namespace",
 	"StorageState",
 }
@@ -195,17 +197,19 @@ func (s *ExperimentStore) scanRows(rows *sql.Rows) ([]*model.Experiment, error)
 	for rows.Next() {
 		var uuid, name, description, namespace, storageState string
 		var createdAtInSec sql.NullInt64
-		err := rows.Scan(&uuid, &name, &description, &createdAtInSec, &namespace, &storageState)
+		var lastRunCreatedAtInSec sql.NullInt64
+		err := rows.Scan(&uuid, &name, &description, &createdAtInSec, &lastRunCreatedAtInSec, &namespace, &storageState)
 		if err != nil {
 			return experiments, err
 		}
 		experiment := &model.Experiment{
-			UUID:           uuid,
-			Name:           name,
-			Description:    description,
-			CreatedAtInSec: createdAtInSec.Int64,
-			Namespace:      namespace,
-			StorageState:   model.StorageState(storageState).ToV2(),
+			UUID:                  uuid,
+			Name:                  name,
+			Description:           description,
+			CreatedAtInSec:        createdAtInSec.Int64,
+			LastRunCreatedAtInSec: lastRunCreatedAtInSec.Int64,
+			Namespace:             namespace,
+			StorageState:          model.StorageState(storageState).ToV2(),
 		}
 		// Since storage state is a field added after initial KFP release, it is possible that existing experiments don't have this field and we use AVAILABLE in that case.
 		if experiment.StorageState == "" || experiment.StorageState == model.StorageStateUnspecified {
@@ -220,6 +224,9 @@ func (s *ExperimentStore) CreateExperiment(experiment *model.Experiment) (*model
 	newExperiment := *experiment
 	now := s.time.Now().Unix()
 	newExperiment.CreatedAtInSec = now
+	// When an experiment has no runs
+	// we default to "1970-01-01T00:00:00Z"
+	newExperiment.LastRunCreatedAtInSec = 0
 	id, err := s.uuid.NewRandom()
 	if err != nil {
 		return nil, util.NewInternalServerError(err, "Failed to create an experiment id")
@@ -236,12 +243,13 @@ func (s *ExperimentStore) CreateExperiment(experiment *model.Experiment) (*model
 	sql, args, err := sq.
 		Insert("experiments").
 		SetMap(sq.Eq{
-			"UUID":           newExperiment.UUID,
-			"CreatedAtInSec": newExperiment.CreatedAtInSec,
-			"Name":           newExperiment.Name,
-			"Description":    newExperiment.Description,
-			"Namespace":      newExperiment.Namespace,
-			"StorageState":   newExperiment.StorageState.ToV2().ToString(),
+			"UUID":                  newExperiment.UUID,
+			"CreatedAtInSec":        newExperiment.CreatedAtInSec,
+			"LastRunCreatedAtInSec": newExperiment.LastRunCreatedAtInSec,
+			"Name":                  newExperiment.Name,
+			"Description":           newExperiment.Description,
+			"Namespace":             newExperiment.Namespace,
+			"StorageState":          newExperiment.StorageState.ToV2().ToString(),
 		}).
 		ToSql()
 	if err != nil {
@@ -411,6 +419,28 @@ func (s *ExperimentStore) UnarchiveExperiment(expId string) error {
 	return nil
 }
 
+func (s *ExperimentStore) SetLastRunTimestamp(run *model.Run) error {
+	expId := run.ExperimentId
+	// SetLastRunTimestamp results in the experiment getting last_run_created_at updated
+	query, args, err := sq.
+		Update("experiments").
+		SetMap(sq.Eq{
+			"LastRunCreatedAtInSec": run.CreatedAtInSec,
+		}).
+		Where(sq.Eq{"UUID": expId}).
+		ToSql()
+	if err != nil {
+		return util.NewInternalServerError(err,
+			"Failed to create query to set experiment LastRunCreatedAtInSec %s. error: '%v'", expId, err.Error())
+	}
+	_, err = s.db.Exec(query, args...)
+	if err != nil {
+		return util.NewInternalServerError(err,
+			"Failed to set experiment LastRunCreatedAtInSec %s. error: '%v'", expId, err.Error())
+	}
+	return nil
+}
+
 // factory function for experiment store.
 func NewExperimentStore(db *DB, time util.TimeInterface, uuid util.UUIDGeneratorInterface) *ExperimentStore {
 	return &ExperimentStore{
diff --git a/frontend/src/lib/Apis.ts b/frontend/src/lib/Apis.ts
index 83ade5db2e0..b78f062a59a 100644
--- a/frontend/src/lib/Apis.ts
+++ b/frontend/src/lib/Apis.ts
@@ -586,6 +586,7 @@ export enum ExperimentSortKeys {
   CREATED_AT = 'created_at',
   ID = 'id',
   NAME = 'name',
+  LAST_RUN_CREATED_AT = 'last_run_created_at',
 }
 
 // Valid sortKeys as specified by the backend.
diff --git a/frontend/src/pages/ExperimentList.tsx b/frontend/src/pages/ExperimentList.tsx
index e7d4dafa821..79350394762 100644
--- a/frontend/src/pages/ExperimentList.tsx
+++ b/frontend/src/pages/ExperimentList.tsx
@@ -104,6 +104,7 @@ export class ExperimentList extends Page<{ namespace?: string }, ExperimentListS
         customRenderer: this._last5RunsCustomRenderer,
         flex: 1,
         label: 'Last 5 runs',
+        sortKey: ExperimentSortKeys.LAST_RUN_CREATED_AT,
       },
     ];
 


Test patch:
diff --git a/backend/src/apiserver/server/api_converter_test.go b/backend/src/apiserver/server/api_converter_test.go
index 1fd706c5c94..0589af3f991 100644
--- a/backend/src/apiserver/server/api_converter_test.go
+++ b/backend/src/apiserver/server/api_converter_test.go
@@ -1974,77 +1974,87 @@ func TestToApiExperimentsV1(t *testing.T) {
 
 func TestToApiExperiments(t *testing.T) {
 	exp1 := &model.Experiment{
-		UUID:           "exp1",
-		CreatedAtInSec: 1,
-		Name:           "experiment1",
-		Description:    "My name is experiment1",
-		StorageState:   "AVAILABLE",
+		UUID:                  "exp1",
+		CreatedAtInSec:        1,
+		LastRunCreatedAtInSec: 1,
+		Name:                  "experiment1",
+		Description:           "My name is experiment1",
+		StorageState:          "AVAILABLE",
 	}
 	exp2 := &model.Experiment{
-		UUID:           "exp2",
-		CreatedAtInSec: 2,
-		Name:           "experiment2",
-		Description:    "My name is experiment2",
-		StorageState:   "ARCHIVED",
+		UUID:                  "exp2",
+		CreatedAtInSec:        2,
+		LastRunCreatedAtInSec: 2,
+		Name:                  "experiment2",
+		Description:           "My name is experiment2",
+		StorageState:          "ARCHIVED",
 	}
 	exp3 := &model.Experiment{
-		UUID:           "exp3",
-		CreatedAtInSec: 1,
-		Name:           "experiment3",
-		Description:    "experiment3 was created using V1 APIV1BETA1",
-		StorageState:   "STORAGESTATE_AVAILABLE",
+		UUID:                  "exp3",
+		CreatedAtInSec:        1,
+		LastRunCreatedAtInSec: 1,
+		Name:                  "experiment3",
+		Description:           "experiment3 was created using V1 APIV1BETA1",
+		StorageState:          "STORAGESTATE_AVAILABLE",
 	}
 	exp4 := &model.Experiment{
-		UUID:           "exp4",
-		CreatedAtInSec: 2,
-		Name:           "experiment4",
-		Description:    "experiment4 was created using V1 APIV1BETA1",
-		StorageState:   "STORAGESTATE_ARCHIVED",
+		UUID:                  "exp4",
+		CreatedAtInSec:        2,
+		LastRunCreatedAtInSec: 2,
+		Name:                  "experiment4",
+		Description:           "experiment4 was created using V1 APIV1BETA1",
+		StorageState:          "STORAGESTATE_ARCHIVED",
 	}
 	exp5 := &model.Experiment{
-		UUID:           "exp5",
-		CreatedAtInSec: 1,
-		Name:           "experiment5",
-		Description:    "My name is experiment5",
-		StorageState:   "this is invalid storage state",
+		UUID:                  "exp5",
+		CreatedAtInSec:        1,
+		LastRunCreatedAtInSec: 1,
+		Name:                  "experiment5",
+		Description:           "My name is experiment5",
+		StorageState:          "this is invalid storage state",
 	}
 	apiExps := toApiExperiments([]*model.Experiment{exp1, exp2, exp3, exp4, nil, exp5})
 	expectedApiExps := []*apiv2beta1.Experiment{
 		{
-			ExperimentId: "exp1",
-			DisplayName:  "experiment1",
-			Description:  "My name is experiment1",
-			CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-			StorageState: apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["AVAILABLE"]),
+			ExperimentId:     "exp1",
+			DisplayName:      "experiment1",
+			Description:      "My name is experiment1",
+			CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+			LastRunCreatedAt: &timestamp.Timestamp{Seconds: 1},
+			StorageState:     apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["AVAILABLE"]),
 		},
 		{
-			ExperimentId: "exp2",
-			DisplayName:  "experiment2",
-			Description:  "My name is experiment2",
-			CreatedAt:    &timestamp.Timestamp{Seconds: 2},
-			StorageState: apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["ARCHIVED"]),
+			ExperimentId:     "exp2",
+			DisplayName:      "experiment2",
+			Description:      "My name is experiment2",
+			CreatedAt:        &timestamp.Timestamp{Seconds: 2},
+			LastRunCreatedAt: &timestamp.Timestamp{Seconds: 2},
+			StorageState:     apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["ARCHIVED"]),
 		},
 		{
-			ExperimentId: "exp3",
-			DisplayName:  "experiment3",
-			Description:  "experiment3 was created using V1 APIV1BETA1",
-			CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-			StorageState: apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["AVAILABLE"]),
+			ExperimentId:     "exp3",
+			DisplayName:      "experiment3",
+			Description:      "experiment3 was created using V1 APIV1BETA1",
+			CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+			LastRunCreatedAt: &timestamp.Timestamp{Seconds: 1},
+			StorageState:     apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["AVAILABLE"]),
 		},
 		{
-			ExperimentId: "exp4",
-			DisplayName:  "experiment4",
-			Description:  "experiment4 was created using V1 APIV1BETA1",
-			CreatedAt:    &timestamp.Timestamp{Seconds: 2},
-			StorageState: apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["ARCHIVED"]),
+			ExperimentId:     "exp4",
+			DisplayName:      "experiment4",
+			Description:      "experiment4 was created using V1 APIV1BETA1",
+			CreatedAt:        &timestamp.Timestamp{Seconds: 2},
+			LastRunCreatedAt: &timestamp.Timestamp{Seconds: 2},
+			StorageState:     apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["ARCHIVED"]),
 		},
 		{},
 		{
-			ExperimentId: "exp5",
-			DisplayName:  "experiment5",
-			Description:  "My name is experiment5",
-			CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-			StorageState: apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["STORAGE_STATE_UNSPECIFIED"]),
+			ExperimentId:     "exp5",
+			DisplayName:      "experiment5",
+			Description:      "My name is experiment5",
+			CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+			LastRunCreatedAt: &timestamp.Timestamp{Seconds: 1},
+			StorageState:     apiv2beta1.Experiment_StorageState(apiv2beta1.Experiment_StorageState_value["STORAGE_STATE_UNSPECIFIED"]),
 		},
 	}
 	assert.Equal(t, expectedApiExps, apiExps)
diff --git a/backend/src/apiserver/server/experiment_server_test.go b/backend/src/apiserver/server/experiment_server_test.go
index 44a1dc2d042..cdea5babcbd 100644
--- a/backend/src/apiserver/server/experiment_server_test.go
+++ b/backend/src/apiserver/server/experiment_server_test.go
@@ -16,6 +16,8 @@ package server
 
 import (
 	"context"
+	"google.golang.org/protobuf/types/known/structpb"
+	"sigs.k8s.io/yaml"
 	"strings"
 	"testing"
 
@@ -66,12 +68,13 @@ func TestCreateExperiment(t *testing.T) {
 	result, err := server.CreateExperiment(nil, &apiV2beta1.CreateExperimentRequest{Experiment: experiment})
 	assert.Nil(t, err)
 	expectedExperiment := &apiV2beta1.Experiment{
-		ExperimentId: DefaultFakeUUID,
-		DisplayName:  "ex1",
-		Description:  "first experiment",
-		CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-		StorageState: apiV2beta1.Experiment_AVAILABLE,
-		Namespace:    "",
+		ExperimentId:     DefaultFakeUUID,
+		DisplayName:      "ex1",
+		Description:      "first experiment",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
+		Namespace:        "",
 	}
 	assert.Equal(t, expectedExperiment, result)
 }
@@ -395,16 +398,18 @@ func TestCreateExperiment_Multiuser(t *testing.T) {
 		{
 			"Valid",
 			&apiV2beta1.Experiment{
-				DisplayName: "exp1",
-				Description: "first experiment",
-				Namespace:   "ns1",
+				DisplayName:      "exp1",
+				Description:      "first experiment",
+				LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+				Namespace:        "ns1",
 			},
 			&apiV2beta1.Experiment{
-				ExperimentId: DefaultFakeUUID,
-				DisplayName:  "exp1",
-				Description:  "first experiment",
-				Namespace:    "ns1",
-				StorageState: apiV2beta1.Experiment_AVAILABLE,
+				ExperimentId:     DefaultFakeUUID,
+				DisplayName:      "exp1",
+				Description:      "first experiment",
+				LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+				Namespace:        "ns1",
+				StorageState:     apiV2beta1.Experiment_AVAILABLE,
 			},
 			false,
 			"",
@@ -481,12 +486,13 @@ func TestGetExperiment(t *testing.T) {
 	result, err := server.GetExperiment(nil, &apiV2beta1.GetExperimentRequest{ExperimentId: createResult.ExperimentId})
 	assert.Nil(t, err)
 	expectedExperiment := &apiV2beta1.Experiment{
-		ExperimentId: createResult.ExperimentId,
-		DisplayName:  "ex1",
-		Description:  "first experiment",
-		CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-		StorageState: apiV2beta1.Experiment_AVAILABLE,
-		Namespace:    "",
+		ExperimentId:     createResult.ExperimentId,
+		DisplayName:      "ex1",
+		Description:      "first experiment",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
+		Namespace:        "",
 	}
 	assert.Equal(t, expectedExperiment, result)
 }
@@ -619,12 +625,13 @@ func TestGetExperiment_Multiuser(t *testing.T) {
 	result, err := server.GetExperiment(ctx, &apiV2beta1.GetExperimentRequest{ExperimentId: createResult.ExperimentId})
 	assert.Nil(t, err)
 	expectedExperiment := &apiV2beta1.Experiment{
-		ExperimentId: createResult.ExperimentId,
-		DisplayName:  "exp1",
-		Description:  "first experiment",
-		CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-		Namespace:    "ns1",
-		StorageState: apiV2beta1.Experiment_AVAILABLE,
+		ExperimentId:     createResult.ExperimentId,
+		DisplayName:      "exp1",
+		Description:      "first experiment",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+		Namespace:        "ns1",
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
 	}
 	assert.Equal(t, expectedExperiment, result)
 }
@@ -667,17 +674,97 @@ func TestListExperiments(t *testing.T) {
 	assert.Nil(t, err)
 	result, err := server.ListExperiments(nil, &apiV2beta1.ListExperimentsRequest{})
 	expectedExperiment := []*apiV2beta1.Experiment{{
-		ExperimentId: createResult.ExperimentId,
-		DisplayName:  "ex1",
-		Description:  "first experiment",
-		CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-		StorageState: apiV2beta1.Experiment_AVAILABLE,
-		Namespace:    "",
+		ExperimentId:     createResult.ExperimentId,
+		DisplayName:      "ex1",
+		Description:      "first experiment",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
+		Namespace:        "",
 	}}
 	assert.Nil(t, err)
 	assert.Equal(t, expectedExperiment, result.Experiments)
 }
 
+func TestListExperimentsByLastRunCreation(t *testing.T) {
+	// Create experiment and runs/jobs under it.
+	clients, manager, experiment1, _ := initWithExperimentAndPipelineVersion(t)
+	defer clients.Close()
+
+	// Create another experiment
+	clients.UpdateUUID(util.NewFakeUUIDGeneratorOrFatal(DefaultFakeIdTwo, nil))
+	manager = resource.NewResourceManager(clients, &resource.ResourceManagerOptions{CollectMetrics: false})
+	server := ExperimentServer{resourceManager: manager, options: &ExperimentServerOptions{CollectMetrics: false}}
+	experiment := &apiV2beta1.Experiment{DisplayName: "exp2"}
+	experiment2, err := server.CreateExperiment(nil, &apiV2beta1.CreateExperimentRequest{Experiment: experiment})
+	assert.Nil(t, err)
+
+	// Create a generic run object
+	pipelineSpecStruct := &structpb.Struct{}
+	yaml.Unmarshal([]byte(v2SpecHelloWorld), pipelineSpecStruct)
+	genericRun := &apiV2beta1.Run{
+		PipelineSource: &apiV2beta1.Run_PipelineSpec{
+			PipelineSpec: pipelineSpecStruct,
+		},
+		RuntimeConfig: &apiV2beta1.RuntimeConfig{
+			Parameters: map[string]*structpb.Value{
+				"param1": structpb.NewStringValue("world"),
+			},
+		},
+	}
+
+	// Create a run in experiment 1
+	clients.UpdateUUID(util.NewFakeUUIDGeneratorOrFatal(DefaultFakeIdThree, nil))
+	manager = resource.NewResourceManager(clients, &resource.ResourceManagerOptions{CollectMetrics: false})
+	runServer := NewRunServer(manager, &RunServerOptions{CollectMetrics: false})
+	genericRun.DisplayName = "run1"
+	genericRun.ExperimentId = experiment1.UUID
+	_, err = runServer.CreateRun(nil, &apiV2beta1.CreateRunRequest{Run: genericRun})
+	assert.Nil(t, err)
+
+	// Create a run in experiment 2
+	clients.UpdateUUID(util.NewFakeUUIDGeneratorOrFatal(DefaultFakeIdFour, nil))
+	manager = resource.NewResourceManager(clients, &resource.ResourceManagerOptions{CollectMetrics: false})
+	runServer = NewRunServer(manager, &RunServerOptions{CollectMetrics: false})
+	genericRun.DisplayName = "run2"
+	genericRun.ExperimentId = experiment2.ExperimentId
+	_, err = runServer.CreateRun(nil, &apiV2beta1.CreateRunRequest{Run: genericRun})
+	assert.Nil(t, err)
+
+	// Expected runs, note that because run 2 in experiment 2
+	// was created last, experiment 2 has the latest run execution
+	experimentServer := ExperimentServer{resourceManager: manager, options: &ExperimentServerOptions{CollectMetrics: false}}
+	expected1 := &apiV2beta1.Experiment{
+		ExperimentId:     experiment1.UUID,
+		DisplayName:      "exp1",
+		Description:      "",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 6},
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
+		Namespace:        "",
+	}
+	expected2 := &apiV2beta1.Experiment{
+		ExperimentId:     experiment2.ExperimentId,
+		DisplayName:      "exp2",
+		Description:      "",
+		CreatedAt:        &timestamp.Timestamp{Seconds: 5},
+		LastRunCreatedAt: &timestamp.Timestamp{Seconds: 8},
+		StorageState:     apiV2beta1.Experiment_AVAILABLE,
+		Namespace:        "",
+	}
+
+	// First list runs sorted by last_run_created_at ascending
+	listExperimentsRequest := &apiV2beta1.ListExperimentsRequest{SortBy: "last_run_created_at asc"}
+	result, err := experimentServer.ListExperiments(nil, listExperimentsRequest)
+	assert.Nil(t, err)
+	assert.Equal(t, []*apiV2beta1.Experiment{expected1, expected2}, result.Experiments)
+
+	// Then list runs sorted by last_run_created_at descending, note the order is switched
+	listExperimentsRequest = &apiV2beta1.ListExperimentsRequest{SortBy: "last_run_created_at desc"}
+	result, err = experimentServer.ListExperiments(nil, listExperimentsRequest)
+	assert.Equal(t, []*apiV2beta1.Experiment{expected2, expected1}, result.Experiments)
+}
+
 func TestListExperimentsV1_Failed(t *testing.T) {
 	clientManager := resource.NewFakeClientManagerOrFatal(util.NewFakeTimeForEpoch())
 	resourceManager := resource.NewResourceManager(clientManager, &resource.ResourceManagerOptions{CollectMetrics: false})
@@ -913,12 +1000,13 @@ func TestListExperiments_Multiuser_NoDefault(t *testing.T) {
 			false,
 			"",
 			[]*apiV2beta1.Experiment{{
-				ExperimentId: createResult.ExperimentId,
-				DisplayName:  "exp1",
-				Description:  "first experiment",
-				CreatedAt:    &timestamp.Timestamp{Seconds: 1},
-				Namespace:    "ns1",
-				StorageState: apiV2beta1.Experiment_AVAILABLE,
+				ExperimentId:     createResult.ExperimentId,
+				DisplayName:      "exp1",
+				Description:      "first experiment",
+				CreatedAt:        &timestamp.Timestamp{Seconds: 1},
+				LastRunCreatedAt: &timestamp.Timestamp{Seconds: 0},
+				Namespace:        "ns1",
+				StorageState:     apiV2beta1.Experiment_AVAILABLE,
 			}},
 		},
 		{
diff --git a/backend/src/apiserver/storage/experiment_store_test.go b/backend/src/apiserver/storage/experiment_store_test.go
index 291a1816f50..366df98b244 100644
--- a/backend/src/apiserver/storage/experiment_store_test.go
+++ b/backend/src/apiserver/storage/experiment_store_test.go
@@ -60,18 +60,20 @@ func TestListExperiments_Pagination(t *testing.T) {
 	experimentStore.uuid = util.NewFakeUUIDGeneratorOrFatal(fakeIDFour, nil)
 	experimentStore.CreateExperiment(createExperiment("experiment2"))
 	expectedExperiment1 := &model.Experiment{
-		UUID:           fakeID,
-		CreatedAtInSec: 1,
-		Name:           "experiment1",
-		Description:    "My name is experiment1",
-		StorageState:   "AVAILABLE",
+		UUID:                  fakeID,
+		CreatedAtInSec:        1,
+		LastRunCreatedAtInSec: 0,
+		Name:                  "experiment1",
+		Description:           "My name is experiment1",
+		StorageState:          "AVAILABLE",
 	}
 	expectedExperiment4 := &model.Experiment{
-		UUID:           fakeIDFour,
-		CreatedAtInSec: 4,
-		Name:           "experiment2",
-		Description:    "My name is experiment2",
-		StorageState:   "AVAILABLE",
+		UUID:                  fakeIDFour,
+		CreatedAtInSec:        4,
+		LastRunCreatedAtInSec: 0,
+		Name:                  "experiment2",
+		Description:           "My name is experiment2",
+		StorageState:          "AVAILABLE",
 	}
 	experimentsExpected := []*model.Experiment{expectedExperiment1, expectedExperiment4}
 	opts, err := list.NewOptions(&model.Experiment{}, 2, "name", nil)
@@ -85,18 +87,20 @@ func TestListExperiments_Pagination(t *testing.T) {
 	assert.Equal(t, 4, total_size)
 
 	expectedExperiment2 := &model.Experiment{
-		UUID:           fakeIDTwo,
-		CreatedAtInSec: 2,
-		Name:           "experiment3",
-		Description:    "My name is experiment3",
-		StorageState:   "AVAILABLE",
+		UUID:                  fakeIDTwo,
+		CreatedAtInSec:        2,
+		LastRunCreatedAtInSec: 0,
+		Name:                  "experiment3",
+		Description:           "My name is experiment3",
+		StorageState:          "AVAILABLE",
 	}
 	expectedExperiment3 := &model.Experiment{
-		UUID:           fakeIDThree,
-		CreatedAtInSec: 3,
-		Name:           "experiment4",
-		Description:    "My name is experiment4",
-		StorageState:   "AVAILABLE",
+		UUID:                  fakeIDThree,
+		CreatedAtInSec:        3,
+		LastRunCreatedAtInSec: 0,
+		Name:                  "experiment4",
+		Description:           "My name is experiment4",
+		StorageState:          "AVAILABLE",
 	}
 	experimentsExpected2 := []*model.Experiment{expectedExperiment2, expectedExperiment3}
 
diff --git a/frontend/src/pages/__snapshots__/ExperimentList.test.tsx.snap b/frontend/src/pages/__snapshots__/ExperimentList.test.tsx.snap
index b9f68eba9b1..4dbd51dd8cc 100644
--- a/frontend/src/pages/__snapshots__/ExperimentList.test.tsx.snap
+++ b/frontend/src/pages/__snapshots__/ExperimentList.test.tsx.snap
@@ -21,6 +21,7 @@ exports[`ExperimentList renders a list of one experiment 1`] = `
           "customRenderer": [Function],
           "flex": 1,
           "label": "Last 5 runs",
+          "sortKey": "last_run_created_at",
         },
       ]
     }
@@ -70,6 +71,7 @@ exports[`ExperimentList renders a list of one experiment with error 1`] = `
           "customRenderer": [Function],
           "flex": 1,
           "label": "Last 5 runs",
+          "sortKey": "last_run_created_at",
         },
       ]
     }
@@ -106,6 +108,7 @@ exports[`ExperimentList renders a list of one experiment with no description 1`]
           "customRenderer": [Function],
           "flex": 1,
           "label": "Last 5 runs",
+          "sortKey": "last_run_created_at",
         },
       ]
     }
@@ -142,6 +145,7 @@ exports[`ExperimentList renders an empty list with empty state message 1`] = `
           "customRenderer": [Function],
           "flex": 1,
           "label": "Last 5 runs",
+          "sortKey": "last_run_created_at",
         },
       ]
     }