Does the upgrade of the servers where Foglight is running on (Foglight Management Server/FMS, Foglight Agent Manager/FglAM, Performance Investigator/PI) affect Foglight?
Before upgrading it should be confirmed that the newer operating system is listed as a supported platform for the installed Foglight release. As servers are stopped during the upgrade process it may be expected for data gaps to be present in Foglight during that time.
IMPORTANT:
Before upgrading the OS, it would be best to get FMS support bundle, backup the Foglight filesystem and backup the Foglight database.
For more details look at the system requirements and platform support guide.