May 2019
Intermediate to advanced
392 pages
5h 49m
Japanese
Content preview from 入門 Prometheus ―インフラとアプリケーションのパフォーマンスモニタリング
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13章PromQL入門
PromQLは、Prometheus Query Language（Prometheus問い合わせ言語）の略である。末尾がQLになっているが、PromQLはあまりSQLとは似ていない。それは、時系列データに対して実行したいタイプの計算では、SQL言語の表現力は貧弱だからである。
PromQLにとってラベルはきわめて重要であり、ラベルがあればさまざまな集計ができるだけでなく、ラベルを使った算術演算で異なるメトリクスを結合できる。PromQLで使える関数は、予測、時刻の操作、数学演算など、多種多様である。
この章では、集計、基本的なデータ型、HTTP APIなど、PromQLの基本概念を説明する。
13.1 集計の基礎
単純な集計クエリ（aggregation query）から始めよう。PromQLの用途の大半は、この種のクエリで占められることになるだろう。PromQLはその気になれば非常に強い力を発揮できるが†1、ほとんどの場合、必要とされる機能はごく単純なものに収まるはずだ。
[†1] 私はふたつの異なる方法でPromQLがチューリング完全であることを示したことがある。本番環境でこんなことはしないように。
13.1.1 ゲージ
ゲージは状態のスナップショットであり、ゲージの集計で行いたいことは、通常は合計、平均の計算と最小値、最大値の検出だろう。
マウントされている個々のファイルシステムのサイズを報告し、device、fstype、mountpointラベルを持つNode exporterのnode_filesystem_size_bytesメトリクスを取り上げてみよう。各マシンのファイルシステム全体のサイズは、次のようにして計算できる。
sum without(device, ...
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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.