zabbix40: drop, no more supported upstream

Security/limited support ended in October 2023.

https://www.zabbix.com/life_cycle_and_release_policy

pkgs/servers/monitoring/zabbix/versions.nix

···
     sha256 = "sha256-+C5fI+eMJKsynVnVJIYj27x1iFQwaG9Fnho0BXgENQI=";
     vendorHash = "sha256-oSZBzIUL1yHXk7PnkSAlhI0i89aGMFrFHmbMN9rDAJ0=";
   };
-
-  v40 = generic {
-    version = "4.0.48";
-    sha256 = "sha256-WK8Zzkd/s9M7N5Qr2kejtp/f/n1wb5zRSfh0RiI2K+Q=";
-  };
 }

pkgs/top-level/aliases.nix

···
 
   ### Z ###
 
+  zabbix40 = throw "'zabbix40' has been removed as it has reached end of life"; # Added 2024-01-07
   zinc = zincsearch; # Added 2023-05-28
   zkg = throw "'zkg' has been replaced by 'zeek'";
   zq = zed.overrideAttrs (old: { meta = old.meta // { mainProgram = "zq"; }; }); # Added 2023-02-06

pkgs/top-level/all-packages.nix

···
     server-mysql = (callPackages ../servers/monitoring/zabbix/server.nix { mysqlSupport = true; }).${version};
     server-pgsql = (callPackages ../servers/monitoring/zabbix/server.nix { postgresqlSupport = true; }).${version};
     web = (callPackages ../servers/monitoring/zabbix/web.nix {}).${version};
+    agent2 = (callPackages ../servers/monitoring/zabbix/agent2.nix {}).${version};
 
     # backwards compatibility
     server = server-pgsql;
-  } // lib.optionalAttrs ( version != "v40" ) {  # agent2 is not supported in v4
-    agent2 = (callPackages ../servers/monitoring/zabbix/agent2.nix {}).${version};
   };
 
   zabbix60 = recurseIntoAttrs (zabbixFor "v60");
   zabbix50 = recurseIntoAttrs (zabbixFor "v50");
-  zabbix40 = dontRecurseIntoAttrs (zabbixFor "v40");
 
   zabbix = zabbix60;