first draft agent info

docs/configuration/zabbix-agent.md

@@ -1,5 +1,87 @@
 # Zabbix Agent
 
-## Zabbix agent Linux
+In this topic we will talk about the Zabbix agent. The Zabbix agent is a native agent made by Zabbix that we can deploy on different Operating Systems and that supports a wide range of build-in items keys.
+Zabbix has 2 agents we have the ```Zabbix agent``` and we have the ```Zabbix agent 2``` So when you read in this book about the ```Zabbix agent``` we talk about the 1st agent. This can sound a bit
+weird having 2 agents but it's not. The agent was developed years ago when zabbix was first released and is written in C the agent 2 is written in GO and is developed next to the Agent 1.
+We will see later what the advantages and disadvantages are of both and give you tips to choose the agent that fits best for you.
+To make things more complex both agents can be configure to work in ```active``` or in ```passive``` mode or in both.
+
+
+So in this topic we will explain you all the differences :
+
+- Zabbix Agent1
+- Zabbix Agent2
+- Agent1 vs Agent2
+- Active Agent
+- Passive Agent
+- Active vs Passive
+- ZZabbix agent windows
+
+
+## Zabbix Agent 1
+
+Our Zabbix agent or the legacy agent can run on a whole set of supported platforms. At the time of writing the agent on Zabbix 7 supports:
+
+- Linux (Redhat, Suse, Ubuntu, Debian, Rocky, Alma, ...)
+- FreeBSD
+- Windows
+- MacOS
+- Raspberry Pi
+- HPUnix
+- OpenBSD
+- AIX
+- Solaris
+
+???+ info
+    A full up to date list can be found here https://www.zabbix.com/download
+
+The agent can be installed on a host to collect data from that host or from an application running on that host.
+The advantage is that the agent has a very small footprint and that we can extend the agent by creating our own scripts.
+Agents can work in active or in passive mode or can do this in both ways simultaniously.
+
+
+
+
+
+
+
+
+
+
+
+
+## Zabbix Agent 2
+
+## Agent1 vs Agent2
+
+| Parameter 			| Agent					 | Agent 2 				|
+| :----				| :----					 |:----					|
+| Programming language 		| C					 | Go and some parts in C		|
+| Linux daemonization 		| Yes					 | By systemd only			|
+| Run as Windows service	| Yes					 | Yes					|
+| Supported extensions		| Loadable Modules in C	 		 | Plugins in Go			|
+| Supported platforms		| All					 | Linux, Window, any OS with GO	|
+| Concurrency			| Active checks are executed sequentialy | All check executed concurrently	|
+| Scheduled/flexible intervals	| Passive check only			 | Acive and Passsive checks		|
+| Persistent storage 		| No					 | Yes (SQLite3)			|
+| Timeout settings		| On agent level only			 | Plugins can override the timout	|
+| Changes user at runtime	| Yes (on Unix like sytems only)	 | No (controlled by SystemD		|
+| Cipersuits user configurable  | Yes					 | No					|
+
+???+ info
+    For more details bout the differences check the official documentation https://www.zabbix.com/documentation/6.0/en/manual/appendix/agent_comparison
+
+
+
+)
+We can detect the generation from the agent by using the ```agent.variant``` item key this will return us if it is agent generation 1 or 2
+
+
+## Active Agent
+
+## Passive Agent
+
+## Active vs Passive 
+
 
 ## Zabbix agent windows