feat(model): add model run count (#431)

Because

- On the Explore page, all models are publicly available. Displaying the
"Run" count will help new users who are unsure of what they need to
start with the most popular models. One of the indicators for popularity
is the number of times a model has been run.
- For users managing their own resources, it allows a quick
understanding of the popularity of their models, whether public or
private.

This commit

- add model run count in model message

---------

Co-authored-by: droplet-bot <[email protected]>

model/model/v1alpha/model.proto

@@ -134,6 +134,14 @@ message Model {
     VISIBILITY_PUBLIC = 2;
   }
 
+  // Statistic data
+  message Stats {
+    // Number of model runs.
+    int32 number_of_runs = 1 [(google.api.field_behavior) = OUTPUT_ONLY];
+    // Last run time.
+    google.protobuf.Timestamp last_run_time = 2 [(google.api.field_behavior) = OUTPUT_ONLY];
+  }
+
   // The resource name of the model, which allows its access by owner and ID.
   // - Format: `users/{user.id}/models/{model.id}`.
   string name = 1 [
@@ -222,6 +230,8 @@ message Model {
   repeated string tags = 30 [(google.api.field_behavior) = OUTPUT_ONLY];
   // Version names.
   repeated string versions = 31 [(google.api.field_behavior) = OUTPUT_ONLY];
+  // Statistic data.
+  Stats stats = 32 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // ListModelsRequest represents a request to list  models.

openapiv2/model/service.swagger.yaml

@@ -1248,6 +1248,11 @@ paths:
                   type: string
                 description: Version names.
                 readOnly: true
+              stats:
+                description: Statistic data.
+                readOnly: true
+                allOf:
+                  - $ref: '#/definitions/ModelStats'
             title: The model to update
             required:
               - id
@@ -1986,6 +1991,11 @@ paths:
                   type: string
                 description: Version names.
                 readOnly: true
+              stats:
+                description: Statistic data.
+                readOnly: true
+                allOf:
+                  - $ref: '#/definitions/ModelStats'
             title: The model to update
             required:
               - id
@@ -2734,6 +2744,20 @@ definitions:
     description: TriggerUserModelRequest represents a request to trigger a model inference.
     required:
       - taskInputs
+  ModelStats:
+    type: object
+    properties:
+      numberOfRuns:
+        type: integer
+        format: int32
+        description: Number of model runs.
+        readOnly: true
+      lastRunTime:
+        type: string
+        format: date-time
+        description: Last run time.
+        readOnly: true
+    title: Statistic data
   googlelongrunningOperation:
     type: object
     properties:
@@ -3817,6 +3841,11 @@ definitions:
           type: string
         description: Version names.
         readOnly: true
+      stats:
+        description: Statistic data.
+        readOnly: true
+        allOf:
+          - $ref: '#/definitions/ModelStats'
     title: |-
       Model represents an AI model, i.e. a program that performs tasks as decision
       making or or pattern recognition based on its training data