Alerts
Warn of meaningful deviations, not every fluctuation.
Alerts only work when threshold, owner and next step are clear in advance.
Zero-result searches
Warn with sudden rise in key query groups.
Latency
Use percentiles and not just averages.
Index freshness
Detect lagging product updates.
Tracking
Signal event failure before dashboards become misleading.
Conversion
Use sufficient volume and similar periods to prevent noise.