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-rw-r--r--nixos/modules/services/monitoring/prometheus/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/monitoring/prometheus/default.nix b/nixos/modules/services/monitoring/prometheus/default.nix
index f516b75ab10f..4f197b9b5820 100644
--- a/nixos/modules/services/monitoring/prometheus/default.nix
+++ b/nixos/modules/services/monitoring/prometheus/default.nix
@@ -1408,7 +1408,7 @@ let
       '';
 
       action =
-        mkDefOpt (types.enum [ "replace" "keep" "drop" "hashmod" "labelmap" "labeldrop" "labelkeep" ]) "replace" ''
+        mkDefOpt (types.enum [ "replace" "lowercase" "uppercase" "keep" "drop" "hashmod" "labelmap" "labeldrop" "labelkeep" ]) "replace" ''
           Action to perform based on regex matching.
         '';
     };