Exam PCA Topic 4 Question 56 Discussion

Actual exam question for Linux Foundation's PCA exam
Question #: 56
Topic #: 4
Given the following Histogram metric data, how many requests took less than or equal to 0.1 seconds?
apiserver_request_duration_seconds_bucket{job="kube-apiserver", le="+Inf"} 3 apiserver_request_duration_seconds_bucket{job="kube-apiserver", le="0.05"} 0 apiserver_request_duration_seconds_bucket{job="kube-apiserver", le="0.1"} 1 apiserver_request_duration_seconds_bucket{job="kube-apiserver", le="1"} 3 apiserver_request_duration_seconds_count{job="kube-apiserver"} 3 apiserver_request_duration_seconds_sum{job="kube-apiserver"} 0.554003785

Suggested Answer: C Vote an answer

In Prometheus, histogram metrics use cumulative buckets to record the count of observations that fall within specific duration thresholds. Each bucket has a label le ("less than or equal to"), representing the upper bound of that bucket.
In the given metric, the bucket labeled le="0.1" has a value of 1, meaning exactly one request took less than or equal to 0.1 seconds. Buckets are cumulative, so:
le="0.05" → 0 requests ≤ 0.05 seconds
le="0.1" → 1 request ≤ 0.1 seconds
le="1" → 3 requests ≤ 1 second
le="+Inf" → all 3 requests total
The _sum and _count values represent total duration and request count respectively, but the number of requests below a given threshold is read directly from the bucket's le value.
Reference:
Verified from Prometheus documentation - Understanding Histograms and Summaries, Bucket Semantics, and Histogram Query Examples sections.

by Bartley at Feb 24, 2026, 07:31 PM

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