In Foglight Experience Monitor (FxM), is it possible to add more than one SSL key file (PEM file) to a monitored server?
Only one SSL key can be added per server/port combination. You can't have multiple files uploaded at the same time. Each time you upload a new SSL file, it will simply overwrite the previous file.
The best practice is, whenever you make a SSL key change to a server being monitored by FxM, to also upload its new key to FxM at that time as well.