_serviceMaintenance() {
    this.all.forEach((service) => {
      // Defines which services should be hibernated.
      if (!service.isActive && (Date.now() - service.lastUsed > ms('5m'))) {
        // If service is stale for 5 min, hibernate it.
        this._hibernate({ serviceId: service.id });
      }
    });
  }
Run various maintenance tasks on services