May 2019
Intermediate to advanced
442 pages
11h 36m
English
Content preview from Hands-On Infrastructure Monitoring with Prometheus
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Having enough data to work with
The rate group of functions (rate, irate, increase, deriv, delta, and idelta) need at least two samples in the supplied range vector to work properly. This means that time ranges that are close to scrape_interval might fail to produce the desired results as a single failed scrape or window alignment issues (scrapes don't happen at exact intervals and might be delayed) will make the range contain only one sample. It is therefore recommended to use 4 (or more) times the scrape_interval to make sure that enough samples are returned for the calculation to work. Following diagram shows failed scrape changing the trend of samples for a given range:
Figure 7.12: A failed scrape changing the trend of samples for a ...
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