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diff --git a/lib/observer/doc/src/notes.xml b/lib/observer/doc/src/notes.xml
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@@ -32,6 +32,45 @@
<p>This document describes the changes made to the Observer
application.</p>
+<section><title>Observer 2.9</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ Since Logger was introduced in OTP-21.0, menu choice
+ <em>Log &gt; Toggle Log View</em> in observer would cause
+ a crash unless an <c>error_logger</c> event handler was
+ explicitly installed. This is now corrected.</p>
+ <p>
+ Own Id: OTP-15553 Aux Id: ERL-848 </p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Since persistent_term was introduced, observer would
+ sometimes crash when expanding a term from a process
+ state. This is now corrected.</p>
+ <p>
+ Own Id: OTP-15493 Aux Id: ERL-810 </p>
+ </item>
+ <item>
+ <p>
+ Add <c>OBSERVER_SCALE</c> environment variable for HiDPI
+ support.</p>
+ <p>
+ Own Id: OTP-15586 Aux Id: PR-2105 </p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Observer 2.8.2</title>
<section><title>Fixed Bugs and Malfunctions</title>