diff --git a/docs/CHANGELOG.asciidoc b/docs/CHANGELOG.asciidoc
index 503feeee30440..57206d86263c2 100644
--- a/docs/CHANGELOG.asciidoc
+++ b/docs/CHANGELOG.asciidoc
@@ -89,7 +89,13 @@ include::upgrade-notes.asciidoc[]
 [[release-notes-8.16.6]]
 == {kib} 8.16.6
 
-The 8.16.6 release includes the following enhancements and fixes.
+The 8.16.6 release includes the following known issues, enhancements, and fixes.
+
+[float]
+[[known-issues-8.16.6]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[enhancement-v8.16.6]]
@@ -119,7 +125,13 @@ Management::
 [[release-notes-8.16.5]]
 == {kib} 8.16.5
 
-The 8.16.5 release includes the following enhancements and bug fixes.
+The 8.16.5 release includes the following known issues, enhancements, and bug fixes.
+
+[float]
+[[known-issues-8.16.5]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[enhancement-v8.16.5]]
@@ -155,7 +167,13 @@ Machine Learning::
 [[release-notes-8.16.4]]
 == {kib} 8.16.4
 
-The 8.16.4 release includes the following bug fixes.
+The 8.16.4 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.16.4]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[fixes-v8.16.4]]
@@ -186,10 +204,21 @@ Kibana security::
 * Fixes breaks in YAML parsing by using single quotes in Structured log template ({kibana-pull}209736[#209736]).
 * Adds missing fields to input manifest templates ({kibana-pull}208768[#208768]).
 * Adds missing fields into AWS S3 manifest ({kibana-pull}208080[#208080]).
+
 [[release-notes-8.16.3]]
 
 == {kib} 8.16.3
 The 8.16.3 release includes the following bug fixes.
+=======
+
+The 8.16.3 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.16.3]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
+
 [float]
 [[fixes-v8.16.3]]
 === Bug fixes
@@ -213,7 +242,13 @@ Kibana security::
 [[release-notes-8.16.2]]
 == {kib} 8.16.2
 
-The 8.16.2 release includes the following enhancements and bug fixes.
+The 8.16.2 release includes the following known issues, enhancements, and bug fixes.
+
+[float]
+[[known-issues-8.16.2]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[enhancement-v8.16.2]]
@@ -262,6 +297,8 @@ Machine Learning::
 For information about the {kib} 8.16.1 release, review the following information.
 
 The 8.16.1 release includes the following known issues.
+=======
+The 8.16.1 release includes the following known issues and bug fixes.
 
 [float]
 [[known-issues-8.16.1]]
@@ -282,6 +319,8 @@ For more information, refer to {kibana-issue}200201[#200201] and {kibana-issue}2
 ====
 
 The 8.16.1 release includes the following bug fixes.
+=======
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[fixes-v8.16.1]]
@@ -313,6 +352,7 @@ The 8.16.0 release includes the following known issues.
 === Known issues
 
 include::CHANGELOG.asciidoc[tag=known-issue-187254]
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [discrete]
 [[known-199902]]
@@ -735,7 +775,13 @@ Management::
 [[release-notes-8.15.5]]
 == {kib} 8.15.5
 
-The 8.15.5 release includes the following bug fixes.
+The 8.15.5 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.15.5]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[fixes-v8.15.5]]
@@ -756,7 +802,13 @@ Platform::
 [[release-notes-8.15.4]]
 == {kib} 8.15.4
 
-The 8.15.4 release includes the following bug fixes.
+The 8.15.4 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.15.4]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[fixes-v8.15.4]]
@@ -784,7 +836,13 @@ Management::
 [[release-notes-8.15.3]]
 == {kib} 8.15.3
 
-The 8.15.3 release includes the following bug fixes.
+The 8.15.3 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.15.3]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[fixes-v8.15.3]]
@@ -821,7 +879,13 @@ Machine Learning::
 [[release-notes-8.15.2]]
 == {kib} 8.15.2
 
-The 8.15.2 release includes the following enhancements and bug fixes.
+The 8.15.2 release includes the following known issues, enhancements, and bug fixes.
+
+[float]
+[[known-issues-8.15.2]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 [float]
 [[enhancement-v8.15.2]]
@@ -868,7 +932,13 @@ Machine Learning::
 [[release-notes-8.15.1]]
 == {kib} 8.15.1
 
-The 8.15.1 release includes the following bug fixes.
+The 8.15.1 release includes the following known issues and bug fixes.
+
+[float]
+[[known-issues-8.15.1]]
+=== Known issues
+
+include::CHANGELOG.asciidoc[tag=known-issue-1991]
 
 // [float]
 // [[enhancement-v8.15.1]]
@@ -951,6 +1021,22 @@ Use the *Workflows* app in Microsoft Teams to create a new webhook URL, as descr
 Update your Microsoft Teams connector to use the new URL before the end of December 2024.
 ====
 
+// tag::known-issue-1991[]
+.PDF and PNG reports time out and fail with an invalid header error if server.protocol is set to http2
+[%collapsible]
+====
+*Details* +
+If you've changed the <<settings,`server.protocol`>> value to `http2`, PDF and PNG reports will fail when you export them from the dashboard, visualization, or Canvas workpad that you're generating a report for.
+
+*Workaround* +
+To temporarily resolve the issue, set `server.protocol` to `http1`. 
+
+*Resolved* +
+This issue is resolved in 8.17.9, 8.18.4, 8.19.0 and later. 
+
+====
+// end::known-issue-1991[]
+
 [discrete]
 [[known-189283]]
 .Incorrect index errors related to inference endpoints