Common patterns

Rate (events per second)

rate(http_requests_total[5m])

p95 latency

histogram_quantile(0.95, sum by (le) (rate(http_request_duration_seconds_bucket[5m])))

Top-3 hosts by CPU

topk(3, system_cpu_usage_percent)

Error rate

sum(rate(http_requests_total{status=~"5.."}[5m])) / sum(rate(http_requests_total[5m]))

Availability over a period

avg_over_time(up[1h])