[Relaxing]

I already know how to do this.

[Artifact]

You can try this solution

PHP Code:

/* Plugin generated by AMXX-Studio */

#include <amxmodx>
#include <amxmisc>

#define PLUGIN "New Plug-In"
#define VERSION "1.0"
#define AUTHOR "author"

new g_Hostname[20]
new temp[20]

public plugin_init() {
    register_plugin(PLUGIN, VERSION, AUTHOR)
    
    set_task(1.0, "Change_Hostname",_,_,_,"b")
    get_cvar_string("hostname", g_Hostname, charsmax(g_Hostname))
    
    set_task(0.5, "Back_Hostname",_,_,_,"d")
    copy("temp", charsmax(temp), g_Hostname)
}


public Change_Hostname() {
    new playersnum = get_playersnum()
    new maxplayers = get_maxplayers()
    new new_Hostname[32]
    formatex(new_Hostname, charsmax(new_Hostname), "%s - %s/%s", temp, playersnum, maxplayers)
    server_cmd("hostname %s", new_Hostname)
}

public Back_Hostname() 
    server_cmd("hostname %s", temp)