changes: Add file for ticket 40491

Signed-off-by: David Goulet <dgoulet@torproject.org>

diff --git a/changes/ticket40491 b/changes/ticket40491
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+  o Major bugfixes (relay, overload state):
+    - Report the general overload state for DNS timeout errors only if X% of all
+      DNS queries over Y seconds are errors. Before that, it only took 1 timeout
+      to report the overload state which was just too low of a threshold. The X
+      and Y values are 1% and 10 minutes respectively but they are also
+      controlled by consensus parameters. Fixes bug 40491; bugfix on
+      0.4.6.1-alpha.