Greetings!
Recently we had a memory stick go out on one of our VxRails nodes, and this has since been corrected.
The issue we encountered was the Alert was sent out correctly, but didn't turn off after we replaced the bad memory.
The alert stayed active on the Memory Array hardware sensor in Solarwinds until we had cleared the logs on the iDrac interface.
We then waited a while for the polling to correct itself and then the sensor was showing green and the alert was no more.
Hoping this might help someone out there that is encountering something similar.
TLDR: if you've corrected hardware issues on a VxRail node and are still getting alerts, clear the logs on the node