Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/troubleshooting/audit/index.md

@@ -0,0 +1,73 @@
+---
+title: Site audit
+linkTitle: Audit
+description: Run this audit before deploying your production site.
+categories: [troubleshooting]
+keywords: []
+menu:
+  docs:
+    parent: troubleshooting
+    weight: 20
+weight: 20
+---
+
+There are several conditions that can produce errors in your published site which are not detected during the build. Run this audit before your final build.
+
+{{< code copy=true >}}
+HUGO_MINIFY_TDEWOLFF_HTML_KEEPCOMMENTS=true HUGO_ENABLEMISSINGTRANSLATIONPLACEHOLDERS=true hugo && grep -inorE "<\!-- raw HTML omitted -->|ZgotmplZ|\[i18n\]|\(<nil>\)|(&lt;nil&gt;)|hahahugo" public/
+{{< /code >}}
+
+_Tested with GNU Bash 5.1 and GNU grep 3.7._
+
+## Example output
+
+![site audit terminal output](screen-capture.png)
+
+## Explanation
+
+### Environment variables
+
+`HUGO_MINIFY_TDEWOLFF_HTML_KEEPCOMMENTS=true`
+: Retain HTML comments even if minification is enabled. This takes precedence over `minify.tdewolff.html.keepComments` in the site configuration. If you minify without keeping HTML comments when performing this audit, you will not be able to detect when raw HTML has been omitted.
+
+`HUGO_ENABLEMISSINGTRANSLATIONPLACEHOLDERS=true`
+: Show a placeholder instead of the default value or an empty string if a translation is missing. This takes precedence over `enableMissingTranslationPlaceholders` in the site configuration.
+
+### Grep options
+
+`-i, --ignore-case`
+: Ignore case distinctions in patterns and input data, so that characters that differ only in case match each other.
+
+`-n, --line-number`
+: Prefix each line of output with the 1-based line number within its input file.
+
+`-o, --only-matching`
+: Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.
+
+`-r, --recursive`
+: Read all files under each directory, recursively, following symbolic links only if they are on the command line.
+
+`-E, --extended-regexp`
+: Interpret PATTERNS as extended regular expressions.
+
+### Patterns
+
+`<!-- raw HTML omitted -->`
+: By default, Hugo strips raw HTML from your markdown prior to rendering, and leaves this HTML comment in its place.
+
+`ZgotmplZ`
+: ZgotmplZ is a special value that indicates that unsafe content reached a CSS or URL context at runtime. See&nbsp;[details].
+
+[details]: https://pkg.go.dev/html/template
+
+`[i18n]`
+: This is the placeholder produced instead of the default value or an empty string if a translation is missing.
+
+`(<nil>)`
+: This string will appear in the rendered HTML when passing a nil value to the `printf` function.
+
+`(&lt;nil&gt;)`
+: Same as above when the value returned from the `printf` function has not been passed through `safeHTML`.
+
+`HAHAHUGO`
+: Under certain conditions a rendered shortcode may include all or a portion of the string H&#xfeff;AHAHUGOSHORTCODE in either uppercase or lowercase. This is difficult to detect in all circumstances, but a case-insensitive search of the output for `HAHAHUGO` is likely to catch the majority of cases without producing false positives.