SLO Negotiation Language
5 exercises — Practice the vocabulary for SLO negotiations: discussing targets with product teams, explaining "tighter SLO means more investment," baseline and trade-off language.
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An SRE is in a meeting with a product team that wants to set an availability SLO of 99.99% for a new internal tool. The SRE responds: "Our current baseline is 99.92%. Moving to 99.99% is a significant reliability investment — let me explain what that means for the team." What does "current baseline" mean in this context?
"Current baseline" in SLO negotiations means the historically measured reliability of the service — the starting point from which any proposed SLO must be evaluated.
Why baseline matters in the negotiation:
• If the baseline is 99.92% and the product team wants 99.99%, they are asking the SRE team to improve reliability by 87.5% — a major engineering investment
• If the baseline is already 99.97%, moving to 99.99% may be achievable with targeted improvements
Standard SRE approach to SLO negotiation:
1. Present the baseline: "Our measured availability over the last 90 days is 99.92%"
2. Show the gap: "Your proposed SLO is 99.99% — that is a 7× reduction in allowed error rate"
3. Quantify the investment: "Achieving 99.99% requires redundant infrastructure, zero-downtime deployments, and 24/7 on-call — here is the engineering effort estimate"
Key vocabulary:
• current baseline — the historically measured reliability of the service, used as the starting point for SLO negotiation
• SLO gap — the difference between the proposed SLO and the current baseline
• reliability investment — engineering effort, infrastructure cost, and operational overhead required to meet a given SLO
• achievable SLO — a target the service can sustainably meet given current architecture and team capacity
Why baseline matters in the negotiation:
• If the baseline is 99.92% and the product team wants 99.99%, they are asking the SRE team to improve reliability by 87.5% — a major engineering investment
• If the baseline is already 99.97%, moving to 99.99% may be achievable with targeted improvements
Standard SRE approach to SLO negotiation:
1. Present the baseline: "Our measured availability over the last 90 days is 99.92%"
2. Show the gap: "Your proposed SLO is 99.99% — that is a 7× reduction in allowed error rate"
3. Quantify the investment: "Achieving 99.99% requires redundant infrastructure, zero-downtime deployments, and 24/7 on-call — here is the engineering effort estimate"
Key vocabulary:
• current baseline — the historically measured reliability of the service, used as the starting point for SLO negotiation
• SLO gap — the difference between the proposed SLO and the current baseline
• reliability investment — engineering effort, infrastructure cost, and operational overhead required to meet a given SLO
• achievable SLO — a target the service can sustainably meet given current architecture and team capacity