Merge pull request #33331 from cransom/netdata-module

netdata service: fix permissions for apps.plugin

nixos/tests/netdata.nix

@@ -0,0 +1,31 @@
+# This test runs netdata and checks for data via apps.plugin
+
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "netdata";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ cransom ];
+  };
+
+  nodes = {
+    netdata =
+      { config, pkgs, ... }:
+        {
+          environment.systemPackages = with pkgs; [ curl jq ];
+          services.netdata.enable = true;
+        };
+    };
+
+  testScript = ''
+    startAll;
+
+    $netdata->waitForUnit("netdata.service");
+    # check if netdata can read disk ops for root owned processes. 
+    # if > 0, successful. verifies both netdata working and 
+    # apps.plugin has elevated capabilities.
+    my $cmd = <<'CMD';
+    curl -s http://localhost:19999/api/v1/data\?chart=users.pwrites | \
+       jq -e '[.data[range(10)][.labels | indices("root")[0]]] | add | . > 0'
+    CMD
+    $netdata->waitUntilSucceeds($cmd);
+  '';
+})