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With the following metrics over the last 5 minutes: up{instance="localhost"} 1 1 1 1 1 up{instance="server1"} 1 0 0 0 0 What does the following query return: min_over_time(up[5m])
Correct Answer: A
The min_over_time() function in PromQL returns the minimum sample value observed within the specified time range for each time series. In the given data: For up{instance="localhost"}, all samples are 1. The minimum value over 5 minutes is therefore 1. For up{instance="server1"}, the sequence is 1 0 0 0 0. The minimum observed value is 0. Thus, the query min_over_time(up[5m]) returns two series - one per instance: {instance="localhost"} 1 {instance="server1"} 0 This query is commonly used to check uptime consistency. If the minimum value over the time window is 0, it indicates at least one scrape failure (target down). Reference: Verified from Prometheus documentation - PromQL Range Vector Functions, min_over_time() definition, and up Metric Semantics sections.
