Add test for client metrics

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

task.go

@@ -118,6 +118,8 @@ type Task interface {
 	Update(context.Context, ...UpdateTaskOpts) error
 	// LoadProcess loads a previously created exec'd process
 	LoadProcess(context.Context, string, IOAttach) (Process, error)
+	// Metrics returns task metrics for runtime specific metrics
+	Metrics(context.Context) (*types.Metric, error)
 }
 
 var _ = (Task)(&task{})
@@ -472,6 +474,18 @@ func (t *task) LoadProcess(ctx context.Context, id string, ioAttach IOAttach) (P
 	}, nil
 }
 
+func (t *task) Metrics(ctx context.Context) (*types.Metric, error) {
+	response, err := t.client.TaskService().Metrics(ctx, &types.MetricsRequest{
+		Filters: []string{
+			"id==" + t.id,
+		},
+	})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+	return response.Metrics[0], nil
+}
+
 func (t *task) checkpointTask(ctx context.Context, index *v1.Index, request *tasks.CheckpointTaskRequest) error {
 	response, err := t.client.TaskService().Checkpoint(ctx, request)
 	if err != nil {