Forum Discussion
Limit what data in Log Analytics to be passed on to Sentinel?
We have been using Sentinel in conjunction with Azure Log Analytics for quite some time to ingest selected security logs (AD, DNS, Windows Security etc.) from VM-agents in our server environment. Las...
Magnus Tjerneld You cannot state which information stored in a Log Analytics workspace is available to Azure Sentinel. It is an all or nothing proposition.
You can control what data gets ingested from the VMs by clicking on the "Windows, Linux, and other sources" link on the Overview page and from there go to the "Data" section. This will show you what logs you are ingesting as well as severity for each log. You can go through the list and see if you can trim down some of the information being imported.
Ok; that's too bad. I dug a little deeper into the increased log volumes and realized that the bulk of the records/sources are not visible under Data Connections.
Previously; before we upgraded the Workspace to onboard "Azure Monitor for VM:s" I was manually pulling a number of selected perfmon counters (CPU, RAM and so on). I did this at a 5 min interval to give me an overview without causing too much data in OMS. But after enabling Azure Monitor for VM:s, a huge number of new counters has been enabled and the resolution is much higher. Over the last 24h I've recieved ~300k datapoints for the 4 VMs I'm monitoring:
| Computer | 11,499 | ||
| LogicalDisk | 205,315 | ||
| Memory | 5,744 | ||
| Processor | 5,744 | ||
| Network | 14,360 |
None of these namespaces are visible under Data Sources in Log Analytics.
It would be great to be able to lower the resolution/interval, but I can't seem to find anywhere to limit the interval on these logs?
I realize that this is now more of an "Azure Monitor for VM:s" question than a Sentinel question.
Magnus Tjerneld Did you check under the "Windows Performance Counters" in the "Data" section?
GaryBushey Yes; only the manual counters that I had set up before I enabled "Azure monitor for VMs" are visible there. AMFVM seems to set up it's own data collection that you don't seem to be able to edit.
- CliveWatson
Microsoft
Please see the GA release info
https://docs.microsoft.com/en-us/azure/azure-monitor/insights/vminsights-ga-release-faq
