1 files changed, 8 insertions, 6 deletions
diff --git a/activestorage/lib/active_storage/previewer.rb b/activestorage/lib/active_storage/previewer.rb
index 3d485988e9..dacab1e7df 100644
--- a/activestorage/lib/active_storage/previewer.rb
+++ b/activestorage/lib/active_storage/previewer.rb
@@ -42,20 +42,22 @@ module ActiveStorage
       #   end
       #
       # The output tempfile is opened in the directory returned by ActiveStorage::Downloading#tempdir.
-      def draw(*argv) # :doc:
-        Tempfile.open("ActiveStorage", tempdir) do |file|
-          capture(*argv, to: file)
-          yield file
+      def draw(*argv) #:doc:
+        ActiveSupport::Notifications.instrument("preview.active_storage") do
+          Tempfile.open("ActiveStorage", tempdir) do |file|
+            capture(*argv, to: file)
+            yield file
+          end
         end
       end
 
       def capture(*argv, to:)
         to.binmode
-        IO.popen(argv) { |out| IO.copy_stream(out, to) }
+        IO.popen(argv, err: File::NULL) { |out| IO.copy_stream(out, to) }
         to.rewind
       end
 
-      def logger
+      def logger #:doc:
         ActiveStorage.logger
       end
   end