Add aws environments to the statistics

but only with the field usedRunners.

internal/runner/abstract_manager.go

@@ -58,7 +58,17 @@ func (n *AbstractManager) DeleteEnvironment(id dto.EnvironmentID) {
 }
 
 func (n *AbstractManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	return map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData{}
+	environments := make(map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData)
+	for _, e := range n.environments.List() {
+		environments[e.ID()] = &dto.StatisticalExecutionEnvironmentData{
+			ID:                 int(e.ID()),
+			PrewarmingPoolSize: e.PrewarmingPoolSize(),
+			IdleRunners:        uint(e.IdleRunnerCount()),
+			UsedRunners:        0,
+		}
+	}
+
+	return environments
 }
 
 func (n *AbstractManager) Claim(_ dto.EnvironmentID, _ int) (Runner, error) {

internal/runner/aws_manager.go

@@ -45,3 +45,22 @@ func (a AWSRunnerManager) Return(r Runner) error {
 	}
 	return nil
 }
+
+// EnvironmentStatistics returns only the used runner for each environment as the prewarming is handled
+// by AWS transparently.
+func (a AWSRunnerManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
+	environments := a.AbstractManager.EnvironmentStatistics()
+
+	for _, r := range a.usedRunners.List() {
+		workload, isAWSRunner := r.(*AWSFunctionWorkload)
+		if !isAWSRunner {
+			log.WithField("workload", workload).Error("Stored runners must be AWS runner")
+			continue
+		}
+
+		environmentID := workload.environment.ID()
+		environments[environmentID].UsedRunners++
+	}
+
+	return environments
+}

internal/runner/nomad_manager.go

@@ -35,15 +35,7 @@ func NewNomadRunnerManager(apiClient nomad.ExecutorAPI, ctx context.Context) *No
 }
 
 func (m *NomadRunnerManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
-	environments := make(map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData)
-	for _, e := range m.environments.List() {
-		environments[e.ID()] = &dto.StatisticalExecutionEnvironmentData{
-			ID:                 int(e.ID()),
-			PrewarmingPoolSize: e.PrewarmingPoolSize(),
-			IdleRunners:        uint(e.IdleRunnerCount()),
-			UsedRunners:        0,
-		}
-	}
+	environments := m.AbstractManager.EnvironmentStatistics()
 
 	for _, r := range m.usedRunners.List() {
 		id, err := nomad.EnvironmentIDFromRunnerID(r.ID())