public static String getClassMethodKey(final String className, final String methodName) {
        return String.join("_", className, methodName);
    }
Get param info key.

@param className  className
@param methodName methodName
@return the key
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-tars/src/main/java/org/apache/shenyu/plugin/tars/cache/ApplicationConfigCache.java