nixos/netdata: fix module when withSystemdJournal = false (#426653)

nixos/modules/services/monitoring/netdata.nix

@@ -447,14 +447,6 @@ in
         permissions = "u+rx,g+x,o-rwx";
       };
 
-      "systemd-journal.plugin" = {
-        source = "${cfg.package}/libexec/netdata/plugins.d/systemd-journal.plugin.org";
-        capabilities = "cap_dac_read_search,cap_syslog+ep";
-        owner = cfg.user;
-        group = cfg.group;
-        permissions = "u+rx,g+x,o-rwx";
-      };
-
       "slabinfo.plugin" = {
         source = "${cfg.package}/libexec/netdata/plugins.d/slabinfo.plugin.org";
         capabilities = "cap_dac_override+ep";
@@ -490,6 +482,15 @@ in
         group = cfg.group;
         permissions = "u+rx,g+x,o-rwx";
       };
+    }
+    // lib.optionalAttrs (cfg.package.withSystemdJournal) {
+      "systemd-journal.plugin" = {
+        source = "${cfg.package}/libexec/netdata/plugins.d/systemd-journal.plugin.org";
+        capabilities = "cap_dac_read_search,cap_syslog+ep";
+        owner = cfg.user;
+        group = cfg.group;
+        permissions = "u+rx,g+x,o-rwx";
+      };
     };
 
     security.pam.loginLimits = [

pkgs/tools/system/netdata/default.nix

@@ -276,7 +276,12 @@ stdenv.mkDerivation (finalAttrs: {
           license = lib.licenses.gpl3Only;
         };
       }).goModules;
-    inherit withIpmi withNetworkViewer withNdsudo;
+    inherit
+      withIpmi
+      withNdsudo
+      withNetworkViewer
+      withSystemdJournal
+      ;
     tests.netdata = nixosTests.netdata;
   };