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SLAs & metrics

Uptime percentages, SLAs, SLOs and recovery times, with the maths worked out.

SLA vs SLO vs SLI - Definitions, Examples and Error Budgets

SLI is what you measure, SLO is the target you aim for, SLA is the promise with consequences. Clear examples, error budget math and a starter set.

7 min read

What Is MTTR? Mean Time to Recovery, MTTD and MTBF Explained

MTTR is the average time from failure to full recovery. Learn the formulas for MTTR, MTTD, MTTA and MTBF with a worked example and ways to lower them.

6 min read

Uptime Percentage Explained (99.9% vs 99.99% in Minutes)

How much downtime 99%, 99.9%, 99.99% and 99.999% uptime allow per year, month, week and day, how to calculate it, and how to measure it.

6 min read