You can clear the health check statistics on the ProxySG by going into the command line interface of the ProxySG and entering the commands as shown below:
ProxySG#(config)health-check
ProxySG#(config health-check)edit <health-check-name>
ProxySG#(config health-check health-check-name)clear-statistics
Here is a working example:
ProxySG#(config)health-check
ProxySG#(config health-check)edit drtr.rating_service
ProxySG#(config health-check drtr.rating_service)clear-statistics
ok