Alert thresholds - hi folks, when you are setting up alerts in Azure monitor or monitoring tools, which metrics do you set thresholds on and more importantly how do you set them up and decide at what value something is significant - which are the top few e.g. CPU at 90% that you think are absolute must includes and are htere any inherently flip-floppy and unstable ? Do you use any tools e.g. excel spreadsheets of historical uses, calculators etc to determine metrics?