# SLI/SLO Management

> Error budget policies and mathematical modeling of SLIs.

- Skill: `j4flmao/sli-slo-management` (Agent Skill)
- Install (CLI): `npx skillmds@latest add j4flmao/sli-slo-management`
- Raw SKILL.md: https://api.skillmd.com/api/skills/j4flmao/sli-slo-management/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Finance & Business
- Author: j4flmao (https://skillmd.com/u/j4flmao)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/j4flmao/sli-slo-management

---

# SLI/SLO Management: Under the Hood

## Mathematical Modeling of SLIs
Service Level Indicators (SLIs) must be quantifiable fractions of good events over total events.
- **Availability SLI**: $SLI_{avail} = \frac{\text{Successful Requests}}{\text{Total Valid Requests}}$
- **Latency SLI**: $SLI_{latency} = \frac{\text{Requests } < 200ms}{\text{Total Requests}}$
- **Continuous Aggregation**: SLIs are typically evaluated over rolling windows (e.g., 28 days) using integration of time-series metrics.

```mermaid
flowchart TD
%%{init: {"theme": "default", "flowchart": {"useMaxWidth": true}}}%%
    subgraph ModelingSLIMathematics ["SLI Mathematics<br><br><br>"]
        Events[Raw Telemetry] -->|"Aggregate(1m)"| Metric[Prometheus Metric]
        Metric -->|"Calculate(Good/Total)"| SLI[SLI Value]
    end
    subgraph ErrorBudgetErrorBudgetPolicies ["Error Budget Policies<br><br><br>"]
        SLI -->|"Compare(SLO)"| Budget[Burn Rate]
        Budget -->|"Check(Burn > 14x)"| Page[PagerDuty Alert]
    end
```

## Error Budget Policies
An error budget represents the allowed unreliability: $1 - \text{SLO}$.
- **Burn Rate Alerts**: Instead of absolute thresholds, alerting is based on the rate of budget consumption. A burn rate of 1 means the budget will be exactly exhausted in the 28-day window.
- **Consequence Automation**: If the 28-day budget falls below 0, CI/CD pipelines are programmatically frozen to enforce reliability over feature velocity.