diff --git a/docs/docsite/rst/installation_guide/_config.rst b/docs/docsite/rst/installation_guide/_config.rst
deleted file mode 100644
index 6f04244e7d7..00000000000
--- a/docs/docsite/rst/installation_guide/_config.rst
+++ /dev/null
@@ -1,3 +0,0 @@
-.. This is a hack to allow doc references to files in other subdirectories.
-
-.. include:: ../reference_appendices/config.rst
diff --git a/test/sanity/code-smell/docs-build.py b/test/sanity/code-smell/docs-build.py
index 614114436d4..bdf3e5027a1 100755
--- a/test/sanity/code-smell/docs-build.py
+++ b/test/sanity/code-smell/docs-build.py
@@ -20,6 +20,33 @@ def main():
         output = warnings_fd.read().strip()
         lines = output.splitlines()
 
+    known_warnings = {
+        'block-quote-missing-blank-line': r'^Block quote ends without a blank line; unexpected unindent.$',
+        'literal-block-lex-error': r'^Could not lex literal_block as "[^"]*". Highlighting skipped.$',
+        'duplicate-label': r'^duplicate label ',
+        'undefined-label': r'undefined label: ',
+        'unknown-document': r'unknown document: ',
+        'toc-tree-missing-document': r'toctree contains reference to nonexisting document ',
+        'reference-target-not-found': r'[^ ]* reference target not found: ',
+        'not-in-toc-tree': r"document isn't included in any toctree$",
+        'unexpected-indentation': r'^Unexpected indentation.$',
+        'definition-list-missing-blank-line': r'^Definition list ends without a blank line; unexpected unindent.$',
+        'explicit-markup-missing-blank-line': r'Explicit markup ends without a blank line; unexpected unindent.$',
+        'toc-tree-glob-pattern-no-match': r"^toctree glob pattern '[^']*' didn't match any documents$",
+        'unknown-interpreted-text-role': '^Unknown interpreted text role "[^"]*".$',
+    }
+
+    ignore_codes = [
+        'literal-block-lex-error',
+        'undefined-label',
+        'unknown-document',
+        'toc-tree-missing-document',
+        'reference-target-not-found',
+        'not-in-toc-tree',
+    ]
+
+    used_ignore_codes = set()
+
     for line in lines:
         match = re.search('^(?P<path>[^:]+):((?P<line>[0-9]+):)?((?P<column>[0-9]+):)? (?P<level>WARNING|ERROR): (?P<message>.*)$', line)
 
@@ -27,11 +54,11 @@ def main():
             path = 'docs/docsite/rst/index.rst'
             lineno = 0
             column = 0
-            level = 'unknown'
+            code = 'unknown'
             message = line
 
             # surface unknown lines while filtering out known lines to avoid excessive output
-            print('%s:%d:%d: %s: %s' % (path, lineno, column, level, message))
+            print('%s:%d:%d: %s: %s' % (path, lineno, column, code, message))
             continue
 
         path = match.group('path')
@@ -45,10 +72,32 @@ def main():
         if path.startswith(base_dir):
             path = path[len(base_dir):]
 
-        if level == 'warning':
-            continue
+        if path.startswith('rst/'):
+            path = 'docs/docsite/' + path  # fix up paths reported relative to `docs/docsite/`
 
-        print('%s:%d:%d: %s: %s' % (path, lineno, column, level, message))
+        if level == 'warning':
+            code = 'warning'
+
+            for label, pattern in known_warnings.items():
+                if re.search(pattern, message):
+                    code = label
+                    break
+        else:
+            code = 'error'
+
+        if code == 'not-in-toc-tree' and path.startswith('docs/docsite/rst/modules/'):
+            continue  # modules are not expected to be in the toc tree
+
+        if code in ignore_codes:
+            used_ignore_codes.add(code)
+            continue  # ignore these codes
+
+        print('%s:%d:%d: %s: %s' % (path, lineno, column, code, message))
+
+    unused_ignore_codes = set(ignore_codes) - used_ignore_codes
+
+    for code in unused_ignore_codes:
+        print('test/sanity/code-smell/docs-build.py:0:0: remove `%s` from the `ignore_codes` list as it is no longer needed' % code)
 
 
 if __name__ == '__main__':