Currently the ModClusterServiceMBean.ping(String) method does 3 things:
1. If parameter is null, send a PING command that determines the accessibility/health of each proxy.
2. If parameter is not a url, interpret the parameter as a jvm route and send a PING command that determines the accessibility of the node, configured with the specified jvm route, from each proxy.
3. If parameter is as a url, interpret the parameter as a url and send a PING command that determines the accessibility of the node (which may or may not be configured in the proxy already) containing a connector matching the protocol, host, and port of the url, from each proxy .

Rather than 1 multi-purpose function - this method should be split in to 3, corresponding to the 3 functions identified above:
Map<InetSocketAddress, String> ping();
Map<InetSocketAddress, String> ping(String jvmRoute);
Map<InetSocketAddress, String> ping(String protocol, String host, int port);

or perhaps:
Map<InetSocketAddress, String> pingProxies();
Map<InetSocketAddress, String> pingNode(String jvmRoute);
Map<InetSocketAddress, String> pingConector(String url);