What is PromQL?
The query language used to read and calculate on Prometheus metrics.
In plain English
PromQL selects time series by name and labels and then applies functions to them. A counter only ever goes up, so you normally wrap it in rate() to see how fast it is growing. You can also aggregate with functions such as sum and by to group results.
Example
rate(http_requests_total[5m]) gives requests per second averaged over the last five minutes.
Where you will meet it
This idea belongs to the subject area of these practice tests. We do not publish or predict real exam questions.
Related terms
- Metrics, logs and traces: The three main kinds of telemetry: numbers over time, event records, and the path of a single request.
- Observability: How well you can understand what is happening inside a system from the data it produces.
Test yourself
Practice tests with an explanation for every answer option, so each mistake teaches you something.
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