I have an environment where the machines are going offline for extensive periods of time, days. During this time, we are collecting some metrics that I'm interested in, the expectation was the agent will submit the data cached locally once online. We increased the size of the cache and that is working as expected, but we find out the agent is still dropping data after 24H logging this event:

Log Name:      Operations Manager
Source:        HealthService
Event ID:      2120
Task Category: Health Service
Level:         Warning
Keywords:      Classic
User:          N/A

Description:
The Health Service has deleted one or more items for management group "NA" which could not be sent in 1440 minutes.

I was advised by MS support to change this registry :

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Operations Manager\3.0\Agent\Management Groups\<Management Group Name>

Find or create a new DWORD value named MaximumQueueAgeMinutes. Set the value to the desired number of minutes. For example, setting it to 2880 will increase the retention period to 48 hours. But is not working, the agent is still login that event and dropping data. Any advice?