KCNA Cloud Native Observability Practice Question
In PromQL, which function would you use to calculate the per-second rate of increase of a counter over a specified time window?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
rate()
The rate() function calculates the per-second average rate of increase of a counter over a time range.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
rate()
Why this is correct
rate() is the correct function for per-second rate of a counter.
- ✗
delta()
Why it's wrong here
delta() is for gauges, not counters.
- ✗
avg_over_time()
Why it's wrong here
avg_over_time() calculates the average of values over time, not applicable for counters.
- ✗
increase()
Why it's wrong here
increase() returns the absolute increase over a range, not per-second rate.
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