Symptom-based
Alert on user impact (high error rate) not cause (memory high). Cause investigated after user-facing alert.
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SLO-based
Burn error budget faster than allowed → alert. Direct link to what matters (users).
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Multi-window multi-burn-rate
Alert if 2% budget burned in 1h OR 5% in 6h. Catches fast + slow burns. Google SRE recommended.