feat: introduce apachebench

knowledge base/ab.md

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+# Apache HTTP server benchmarking tool
+
+> TODO
+
+Intro
+
+<!-- Remove this line to uncomment if used
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+apt install 'apache2-utils'
+dnf install 'httpd-tools'
+```
+
+</details>
+
+<details>
+  <summary>Usage</summary>
+
+```sh
+# Limited number of requests
+ab -n '750' -c '1' 'http://grafana.example.org/'
+
+# Sustained load for 't' seconds
+# Default requests limit is 50000
+ab -t 300 -c 100 http://192.168.29.20/
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+
+### Sources
+
+- [Load Testing in Linux With ApacheBench (ab)]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+<!-- Files -->
+<!-- Upstream -->
+[website]: https://httpd.apache.org/docs/current/programs/ab.html
+
+<!-- Others -->
+[load testing in linux with apachebench (ab)]: https://www.baeldung.com/linux/ab-apachebench-load-testing