Error budget by SLO

allowed downtime per period, how much budget is already spent, and the erroring-requests limit

Parameters

SLO

Actual uptime, %

Requests/sec

Downtime budget

per day1.4 min

per week10.1 min

per month (30d)43.2 min

per quarter (90d)2.2 h

per year (365d)8.8 h

Monthly budget spent150%

1.1 h of 43.2 min

Erroring requests/mo1 296,00k

Error budget = 100% − SLO: the "allowed" amount of failure you can spend on releases and experiments. While budget remains — ship; once exhausted — freeze features, stabilize only (the Google SRE rule). Each extra nine divides the budget by 10.

Over Error Budget

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