diff --git a/.gitignore b/.gitignore
index 375db3d02ce28..0a0f0118d5c1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -331,3 +331,6 @@ third_party/rust/target/
 
 # Buckup files that are generated by //tools/metrics/histograms/pretty_print.py in presubmit.
 /*.before.pretty-print.xml
+
+# Extensions: Generated DNR e.g. /_metadata/generated_indexed_rulesets/_ruleset1
+**/_metadata/generated_indexed_rulesets/