Document OAuth token limitations for Salesforce (#48299)

* Document OAuth token limitations for Salesforce

Added note about OAuth token limitations for Salesforce integration.

* Apply suggestions from code review

Co-authored-by: subham sarkar <sarkar.subhams2@gmail.com>

* Apply suggestions from code review

Co-authored-by: Visha Angelova <91186315+vishaangelova@users.noreply.github.com>

---------

Co-authored-by: subham sarkar <subham.sarkar@elastic.co>
Co-authored-by: subham sarkar <sarkar.subhams2@gmail.com>
Co-authored-by: Visha Angelova <91186315+vishaangelova@users.noreply.github.com>
(cherry picked from commit eff88ab)

Author: 3 people

docs/reference/filebeat/filebeat-input-salesforce.md

@@ -85,6 +85,15 @@ filebeat.inputs:
 
 In order to use this integration, users need to create a new Salesforce Application using OAuth. Follow the steps below to create a connected application in Salesforce:
 
+::::{note}
+**OAuth token limit**
+
+Salesforce enforces a limit of [5 concurrent access tokens](https://help.salesforce.com/s/articleView?id=xcloud.remoteaccess_request_manage.htm&type=5) per user, per connected app. If you configure more than 5 inputs using the same connected app credentials, generating a new token will automatically revoke the oldest one, causing errors.
+
+To avoid this, you must distribute your inputs across multiple connected apps. We recommend assigning a maximum of 5 inputs to each connected app to ensure stability.
+
+::::
+
 1. Login to [Salesforce](https://login.salesforce.com/) with the same user credentials that the user wants to collect data with.
 2. Click on Setup on the top right menu bar. On the Setup page, search for `App Manager` in the `Search Setup` search box at the top of the page, then select `App Manager`.
 3. Click *New Connected App*.