Merge pull request #2968 from SEKOIA-IO/Bug/IFunctional_temporal_offset_on_many_intakes

docs(integration): add UTC timezone prerequisite for IIS, F5 and Windows

Author: TOUFIKIzakarya

docs/integration/categories/applicative/microsoft_iis.md

@@ -16,6 +16,10 @@ Microsoft Internet Information Services (IIS) is a web server software for Windo
 
 This setup guide will show you how to forward your Microsoft IIS logs to Sekoia.io by means of a syslog transport channel.
 
+!!! Warning
+    To avoid time offset issues when events are parsed by Sekoia.io (e.g. events appearing to happen in the future), you *must* configure your server's timezone to **UTC**. 
+    You can find more information in the [Sekoia timezone requirements document](https://docs.sekoia.io/xdr/FAQ/datetime/).
+
 ### Create your intake
 
 1. Go to the [intake page](https://app.sekoia.io/operations/intakes) and create a new intake from the `Microsoft IIS`.

docs/integration/categories/network/f5-big-ip.md

@@ -46,6 +46,12 @@ F5's BIG-IP is a family of products covering software and hardware designed arou
 
 ## Step-by-Step Configuration Procedure
 
+!!! Warning
+    To avoid time offset issues when events are parsed by Sekoia.io (e.g. events appearing to happen in the future), you *must* configure your system's timezone to **UTC**.
+    You can find more information in the [Sekoia timezone requirements document](https://docs.sekoia.io/xdr/FAQ/datetime/).
+    
+    Please refer to the official F5 documentation [K9098 - Configuring the time zone](https://my.f5.com/manage/s/article/K9098) to properly set your appliance to UTC.
+
 ### Instructions on the 3rd Party Solution
 
 To configure an F5 BIG-IP system to send its Common Event Format (CEF) logs via syslog to a remote syslog server, you need to follow these steps.