nixos/goss: init

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diff --git a/nixos/modules/services/monitoring/goss.md b/nixos/modules/services/monitoring/goss.md
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+# Goss {#module-services-goss}
+
+[goss](https://goss.rocks/) is a YAML based serverspec alternative tool
+for validating a server's configuration.
+
+## Basic Usage {#module-services-goss-basic-usage}
+
+A minimal configuration looks like this:
+
+```
+{
+  services.goss = {
+    enable = true;
+
+    environment = {
+      GOSS_FMT = "json";
+      GOSS_LOGLEVEL = "TRACE";
+    };
+
+    settings = {
+      addr."tcp://localhost:8080" = {
+        reachable = true;
+        local-address = "127.0.0.1";
+      };
+      command."check-goss-version" = {
+        exec = "${lib.getExe pkgs.goss} --version";
+        exit-status = 0;
+      };
+      dns.localhost.resolvable = true;
+      file."/nix" = {
+        filetype = "directory";
+        exists = true;
+      };
+      group.root.exists = true;
+      kernel-param."kernel.ostype".value = "Linux";
+      service.goss = {
+        enabled = true;
+        running = true;
+      };
+      user.root.exists = true;
+    };
+  };
+}
+```