May 2019
Intermediate to advanced
442 pages
11h 36m
English
Content preview from Hands-On Infrastructure Monitoring with Prometheus
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Histogram
Recording numerical data that's inherent to each event in a system can be expensive, so some sort of pre-aggregation is usually needed to conserve at least partial information about what happened. However, by pre-calculating aggregations on each instance (such as average since process start, rolling window, exponentially weighted, and so on), a lot of granularity is lost and some calculations can be computationally costly. Adding to this, a lot of pre-aggregations can't generally be re-aggregated without losing meaning—the average of a thousand pre-calculated 95th percentiles has no statistical meaning. Similarly, having the 99th percentile of request latency collected from each instance of a given cluster (for example) gives you ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.