Reliability is not a cost center
Reliability engineering is often treated as insurance — something you pay for but hope never to use. This framing is wrong. Reliability is revenue protection.
Every minute of downtime has a cost. Every degraded experience has a cost. Every incident that requires a war room has a cost. These costs compound and they are almost always larger than the investment required to prevent them.
Pricing the cost of an incident
- Direct cost: Revenue lost during downtime, SLA credits, infrastructure costs of recovery
- Indirect cost: Engineering time diverted to incident response, delayed roadmap items
- Trust cost: Customer confidence erosion, team morale impact, the slow tax of operating a system people do not trust
SLOs as a business contract
Service Level Objectives are not engineering metrics. They are business contracts. "99.9% availability" means roughly 8 hours of downtime per year. "99.95%" means roughly 4 hours. The business must decide which level the product requires.
The question is not whether you can afford reliability engineering. The question is whether you can afford the incidents that happen without it.