The alarm "Windows Memory Free Physical Memory Alarm" was introduced in our last release 15.1.1. As the alarm did not previously exist, customer will start seeing this alarm now after upgrading.
This has been a topic for some environments where this alarm is firing consistently and across all the connections. It happens due to the default values being too low/sensitive for your environment.
In order to configure this alarm in a way to avoid the client being flood with it we can either disable the alarm or adjust the thresholds of it to more suitable ranges that don't cause floods of alarms.