8.17.0 known issue — D4C broken (#6481) (#6484)

(cherry picked from commit 32935c3)

Co-authored-by: Benjamin Ironside Goldstein <91905639+benironside@users.noreply.github.com>

Author: mergify[bot]

docs/release-notes/8.17.asciidoc

@@ -58,6 +58,13 @@ Affected users who are unable to upgrade should set one or both of the following
 [[known-issue-8.17.0]]
 ==== Known issues
 
+[discrete]
+.Defend for Containers (D4C) is broken in 8.17.0
+[%collapsible]
+====
+Defend for Containers is broken in 8.17.0. If you use it, consider updating to 8.17.1 instead.
+====
+
 // tag::known-issue[201820]
 [discrete]
 .The **Exceptions** tab won't properly load if exceptions contain comments with newline characters (`\n`)