medium10 pts · first answer countsprometheusmetrics

A label that broke Prometheus

After a developer added a user_id label to http_requests_total, Prometheus memory use grew quickly and queries became slow. Why?

A.Prometheus cannot store labels that contain numbersB.Each unique label combination is a separate time series, so a user_id label created millions of seriesC.Counters cannot have more than three labelsD.The label made the scrape interval longer

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A label that broke Prometheus

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