No aware of anything from AXL, however there is the CLI 'utils network ping' command:
Possibly your app could discover the hostnames/IPs of the various nodes (i.e. via AXL), then use a SSH library to login to each CUCM and execute the CLI command in turn, parsing the results. However, your app would need to have CLI credentials/access which is could be a significant barrier. Note also that as this method would not be via a supported 'API', backward compatibility could be affected, e.g. due to some future change in how the CLI works or the text output of the command.
