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Comprehensive LogQL Commands Tutorial

Introduction

LogQL (LogsQL) is a query language used within VictoriaMetrics to search, filter, and analyze log data. It is designed for efficient log retrieval, enabling users to extract specific log entries based on time, content, metadata, or numeric calculations. This tutorial provides a detailed overview of LogQL commands—primarily filters and mathematical operations—along with examples to help you construct effective queries. The content is structured for both beginners and advanced users, serving as a reference for future use.

Basic Structure of a LogQL Query

A LogQL query consists of:

Filters: Criteria to select logs, such as time ranges, words, or field values. At least one filter is required.
Optional Actions: Operations like stats, fields, or eval applied to filtered logs, separated by the pipe (|) operator.

Yes, it is possible to integrate ModSecurity with HAProxy, but it requires using ModSecurity as a standalone service with HAProxy’s Stream Processing Offload Engine (SPOE) and a Stream Processing Offload Agent (SPOA), such as jcmoraisjr/modsecurity-spoa. This approach offloads ModSecurity’s processing to a dedicated agent, allowing HAProxy to filter HTTP traffic through ModSecurity rules without embedding ModSecurity directly into HAProxy. Below, I’ll outline the steps to achieve this integration, focusing on a typical setup using a Linux distribution like CentOS or Ubuntu, and address the feasibility based on your context.

Feasibility

ModSecurity v2 Support: HAProxy integrates well with ModSecurity v2 using SPOE and SPOA, as demonstrated in several community projects.
ModSecurity v3 Support: Support for ModSecurity v3 is less mature. The core ModSecurity v3 library (libmodsecurity) requi

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