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diff --git a/doc/v5compatibility.html b/doc/v5compatibility.html
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@@ -16,6 +16,11 @@ available. This processing was redundant and had a lot a drawbacks.
For details, please see the
<a href="v4compatibility.html">rsyslog v4 compatibility notes</a> which elaborate
on the reasons and the (few) things you may need to change.
+<h2>Queue on-disk format</h2>
+<p>The queue information file format has been changed. When upgrading from v4 to
+v5, make sure that the queue is emptied and no on-disk structure present. We did
+not go great length in understanding the old format, as there was too little demand
+for that (and it being quite some effort if done right).
<h2>Queue Worker Thread Shutdown</h2>
<p>Previous rsyslog versions had the capability to &quot;run&quot; on zero queue worker
if no work was required. This was done to save a very limited number of resources. However,