Practice SLO implementation vocabulary: availability targets, error budgets, burn rates, budget exhaustion, and error budget alerting strategies.
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'We set a 99.9% ___ SLO.' Which noun describes the type of SLO?
A 99.9% availability SLO (Service Level Objective) means the service must be up and serving successfully for at least 99.9% of the time in a given window — about 43 minutes of allowed downtime per month.
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'The error budget is 43 ___ per month.' Which unit of time fits a 99.9% SLO?
A 99.9% SLO allows 0.1% error — which equals approximately 43.2 minutes per 30-day month. The error budget is the amount of acceptable downtime or errors before the SLO is breached.
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'We're burning 3× the error budget ___.' Which noun follows 'rate' in this context?
'Error budget burn rate' measures how fast the error budget is being consumed relative to the allowed rate. A 3× burn rate means the budget will be exhausted 3 times faster than planned.
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'The SLO dashboard shows we have 12 ___ remaining.' Which unit fits error budget context?
Error budget remaining is typically expressed in time (minutes remaining in the budget window) or as a percentage. '12 minutes remaining' means the service can afford only 12 more minutes of downtime this month.
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What is 'error budget alerting'?
Error budget alerting fires proactively based on burn rate — e.g., alert if you'll exhaust the budget in less than 2 days at current burn rate. This gives teams time to act before an SLO breach.