Update cheatsheets

tldr/zabbix_agent2

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zabbix_agent2
+
+> Daemon for monitoring server parameters.
+> More information: <https://manned.org/zabbix_agent2>.
+
+- Start the agent with the default configuration file:
+
+`zabbix_agent2`
+
+- Start the agent with a custom configuration file:
+
+`zabbix_agent2 {{[-c|--config]}} {{path/to/zabbix_agent2.conf}}`
+
+- Test the configuration file and exit:
+
+`zabbix_agent2 {{[-c|--config]}} {{path/to/zabbix_agent2.conf}} {{[-T|--test-config]}}`
+
+- Test a specific item with verbose output:
+
+`zabbix_agent2 {{[-c|--config]}} {{path/to/zabbix_agent2.conf}} {{[-t|--test]}} {{item_key}} {{[-v|--verbose]}}`
+
+- Reload user parameters from the configuration file (runtime control):
+
+`zabbix_agent2 {{[-c|--config]}} {{path/to/zabbix_agent2.conf}} {{[-R|--runtime-control]}} userparameter_reload`
+
+- Increase or decrease log level (runtime control):
+
+`zabbix_agent2 {{[-c|--config]}} {{path/to/zabbix_agent2.conf}} {{[-R|--runtime-control]}} loglevel {{increase|decrease}}`
+
+- Display help:
+
+`zabbix_agent2 {{[-h|--help]}}`