In this video, I explain how Prometheus / PromQL data selection works in detail. I go into instant and range vector selectors, label matchers, the 5-minute lookback delta for instant vector selectors, staleness markers and staleness handling, and then explain relative offsets and absolute "@" timestamps for selectors.
Check out my Prometheus training courses if you want to learn Prometheus in a structured way from the ground up:
training.promlabs.com/
The Prometheus blog post about the "@" modifier, as mentioned in the video:
prometheus.io/blog/2021/02/18...
Chapters:
00:00 Introduction
00:49 Instant Vector Selectors
02:54 Label Matchers
04:32 Visualizing Instant Vector Selector Behavior (Lookback Delta)
06:01 Staleness Markers and Staleness Handling
07:33 Range Vector Selectors
08:56 Visualizing Range Vector Selector Behavior
09:26 Relative Offsets ("offset" Modifier)
10:02 Visualizing Offsets for Instant Vector Selectors
10:28 Offset Use Cases
11:07 Visualizing Offsets for Range Vector Selectors
11:17 Absolute Evaluation Timestamps ("@" modifier)
12:18 Visualizing Absolute Evaluation Timestamps
12:53 Syntactic Order for Modifiers
13:34 Outro & PromLabs Trainings
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Негізгі бет Ғылым және технология PromQL Data Selection Explained | Selectors, Lookback Delta, Offsets, and Absolute "@" Timestamps
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