What it means
Availability depends on the entire service path: identity, network, compute, storage, data, dependencies, quotas, deployment processes, and operational response.
Why it matters
A provider can make infrastructure highly available while the customer still creates a single point of failure in application design or configuration.
Practical focus
- Identify single points of failure across the full dependency chain
- Distribute components across appropriate failure domains
- Automate health checks and replacement
- Measure achieved availability against business targets
Common mistakes
- Adding duplicate servers behind one fragile dependency
- Ignoring quotas and control-plane dependencies
- Equating backup with availability
Certification relevance
This subject appears in or supports the following certification bodies of knowledge: