add Icinga2 import high level picture

infrastructure-guide/icinga2.md

@@ -24,11 +24,12 @@ Configuration which is shared and used by both type of systems are found in the
 ### Puppet Managed Nodes
 
 The individual host configuration is automatically generated using already known information sources like
+- Sysdb
 - Hiera
 - Puppet Facts
 - NetOps
 
-TODO: diagram, details how this is achieved
+![high level idea of Linux computer data import to Icinga2](icinga2/icinga2_import_big_picture.png)
 
 The Icinga Director import pipeline is provides as [Configuration Basket template `awi-lx-sysdb`](https://git.psi.ch/linux-infra/bootstrap/-/blob/prod/ansible/roles/icinga_master/templates/Director-Basket_awi-lx-sysdb.json)
 

infrastructure-guide/icinga2/icinga2_import_big_picture.puml

@@ -0,0 +1,20 @@
+@startuml
+
+skinparam componentStyle rectangle
+
+component "Icinga2 Master" as master
+component "Director" as director
+database "Sysdb" as sysdb
+database "NetOps" as netops
+database "Hiera" as hiera
+database "Puppet Facts" as facts
+interface "Sysdb API" as sysdb_api
+
+sysdb --> sysdb_api
+hiera --> sysdb_api
+facts --> sysdb_api
+netops --> sysdb_api
+sysdb_api --> director
+director --> master
+
+@enduml