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Convert an availability target (99.9%, 99.99%…) into allowed downtime per day, week, month, and year, then track error-budget burn — the core SRE math.
Unavailability of 0.100% of the time.
| per day | 1m 26s |
| per week | 10m 5s |
| per 30-day month | 43m 12s |
| per quarter (90d) | 2h 9m 36s |
| per year (365d) | 8h 45m 36s |
Error budget = the downtime you're allowed. When it's spent, the SRE playbook says freeze risky launches and spend the next cycle on reliability.