runservice executor: report ActiveTasksLimit

Add a config option to set the active tasks limit and report it.

internal/services/config/config.go

@@ -82,6 +82,8 @@ type RunServiceExecutor struct {
 	Web Web `yaml:"web"`
 
 	Labels map[string]string `yaml:"labels"`
+	// ActiveTasksLimit is the max number of concurrent active tasks
+	ActiveTasksLimit int `yaml:"active_tasks_limit"`
 }
 
 type ConfigStore struct {

internal/services/runservice/executor/executor.go

@@ -663,10 +663,11 @@ func (e *Executor) sendExecutorStatus(ctx context.Context) error {
 	labels["arch"] = arch
 
 	executor := &types.Executor{
-		ID:          e.id,
-		ListenURL:   e.listenURL,
-		Labels:      labels,
-		ActiveTasks: activeTasks,
+		ID:               e.id,
+		ListenURL:        e.listenURL,
+		Labels:           labels,
+		ActiveTasksLimit: e.c.ActiveTasksLimit,
+		ActiveTasks:      activeTasks,
 	}
 
 	log.Debugf("send executor status: %s", util.Dump(executor))

internal/services/runservice/types/types.go

@@ -658,7 +658,8 @@ type Executor struct {
 
 	Labels map[string]string `json:"labels,omitempty"`
 
-	ActiveTasks int `json:"active_tasks,omitempty"`
+	ActiveTasksLimit int `json:"active_tasks_limit,omitempty"`
+	ActiveTasks      int `json:"active_tasks,omitempty"`
 
 	// internal values not saved
 	Revision int64 `json:"-"`