フリー問題

問題文

A queue length metric was implemented as a Counter and now shows a value that only ever rises, even though the queue drains regularly. Which explanation fits?

選択肢

1. The temporality is cumulative, so the value never resets and the drains are invisible in the exported series.
2. A Counter only ever goes up by definition, so the instrument kind does not match the value being measured.
3. The View overrode the aggregation.
4. A Counter reports the cumulative sum of every measurement, which the backend has to differentiate before displaying it, so the raw series is expected to look like this.