I'm preparing a session on our product's HLD (High-Level Design) for newbies. It's a microservices-based system that includes several self-managed open-source projects & other managed services (e.g. Kafka, Redis, etc.)
I want to address those services in my presentation in a unified manner - services that are not internally developed and maintained but still play a part in the overall system environment.
Is there such a term\concept, which I can also further read about?