Update cheatsheets

tldr/zabbix_server

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zabbix_server
+
+> Core daemon of Zabbix software.
+> More information: <https://manned.org/zabbix_server>.
+
+- Start the server with the default configuration file:
+
+`zabbix_server`
+
+- Start the server with a custom configuration file:
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}}`
+
+- Run the server in foreground:
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}} {{[-f|--foreground]}}`
+
+- Test the configuration file and exit:
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}} {{[-T|--test-config]}}`
+
+- Reload configuration cache (runtime control):
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}} {{[-R|--runtime-control]}} config_cache_reload`
+
+- Execute the housekeeper (runtime control):
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}} {{[-R|--runtime-control]}} housekeeper_execute`
+
+- Increase or decrease log level for all processes (runtime control):
+
+`zabbix_server {{[-c|--config]}} {{path/to/zabbix_server.conf}} {{[-R|--runtime-control]}} log_level_{{increase|decrease}}`
+
+- Display help:
+
+`zabbix_server {{[-h|--help]}}`