Prometheus Monitoring System Histogram and Summary
Business systems designed monitoring metrics of type Summary, calculating the average duration: request_duration_milliseconds_sum / request_duration_milliseconds_count.
Reviewing the data, a particular interface was found to have very high average duration, and when examining the time series chart, the average duration suddenly increased – effectively, one request took a long time, which pulled up the overall average. The goal was to identify exactly when this request occurred, but due to the low number of requests within the period, the data retrieved remained empty.