NOTE
Deployment Diagrams
Mapping software artifacts and services onto runtime nodes, networks, zones, and infrastructure.
This is a historical learning note and may contain outdated or incomplete understanding.
A deployment diagram maps software components onto runtime infrastructure such as hosts, containers, clusters, zones, load balancers, databases, and external services.
It should make operational boundaries visible: replicas, regions/zones, network hops, stateful dependencies, and critical ingress/egress paths. This view is useful for availability and failure-domain analysis because logical architecture alone does not show where correlated failures can occur.