I want to keep console logging , but want to suppress any messages that contain this string, any help is much appreciated.
Try adding a discriminator to the logging:
*Jun 10 19:54:52.727: %ENVMON-4-FAN_LOW_RPM: Fan 2 service recommended
*Jun 10 19:55:22.727: %ENVMON-4-FAN_LOW_RPM: Fan 2 service recommended
logging discriminator ENV severity drops 4 facility drops ENVMON mnemonics drops FAN_LOW_RPM
logging console discriminator ENV
logging monitor discriminator ENV
logging buffered discriminator ENV
logging host X.X.X.X discriminator ENV
Perfect, thanks very much Jon.