Alert Threshold Calculator
Calculate SLO-based alert thresholds using multi-window, multi-burn-rate alerting
SLO Configuration
Select a preset or configure custom SLO targets
High-availability API with 99.9% uptime SLO
Use Case: Customer-facing API, ~43 minutes downtime/month allowed
SLO Target
99.90%
Error Budget
0.100%
Allowed Downtime
43 minutes
per 30d
Calculated Alert Thresholds
Multi-window, multi-burn-rate alerts based on Google SRE best practices
Critical: 14.4x Error Budget Burn
14.4x faster than acceptable error rate
Detection Window
1h
Lookback Window
1h
Budget Consumed
2.0%
Time to Exhaustion
2 days
Critical: 6x Error Budget Burn
6x faster than acceptable error rate
Detection Window
6h
Lookback Window
6h
Budget Consumed
5.0%
Time to Exhaustion
5 days
Warning: 3x Error Budget Burn
3x faster than acceptable error rate
Detection Window
24h
Lookback Window
24h
Budget Consumed
10.0%
Time to Exhaustion
1 weeks
Warning: 1x Error Budget Burn
1x faster than acceptable error rate
Detection Window
7d
Lookback Window
7d
Budget Consumed
23.3%
Time to Exhaustion
4 weeks
Export Alert Configuration
Copy-paste Prometheus/Grafana alert rules
# API Availability - 99.90% SLO
# Error Budget: 0.10% over 30d
groups:
- name: api_availability_alerts
interval: 30s
rules:
- alert: "Critical: 14.4x Error Budget Burn"
expr: |
(
sum(rate(http_requests_total{status=~"5.."}[1h]))
/
sum(rate(http_requests_total[1h]))
) > 0.0144
for: 1h
labels:
severity: critical
slo: API Availability
annotations:
summary: "High error rate detected (14.4x burn rate)"
description: "Error budget will be exhausted in 2 days"
- alert: "Critical: 6x Error Budget Burn"
expr: |
(
sum(rate(http_requests_total{status=~"5.."}[6h]))
/
sum(rate(http_requests_total[6h]))
) > 0.006
for: 6h
labels:
severity: critical
slo: API Availability
annotations:
summary: "High error rate detected (6x burn rate)"
description: "Error budget will be exhausted in 5 days"
- alert: "Warning: 3x Error Budget Burn"
expr: |
(
sum(rate(http_requests_total{status=~"5.."}[24h]))
/
sum(rate(http_requests_total[24h]))
) > 0.003
for: 24h
labels:
severity: warning
slo: API Availability
annotations:
summary: "High error rate detected (3x burn rate)"
description: "Error budget will be exhausted in 1 weeks"
- alert: "Warning: 1x Error Budget Burn"
expr: |
(
sum(rate(http_requests_total{status=~"5.."}[7d]))
/
sum(rate(http_requests_total[7d]))
) > 0.001
for: 7d
labels:
severity: warning
slo: API Availability
annotations:
summary: "High error rate detected (1x burn rate)"
description: "Error budget will be exhausted in 4 weeks"