Start release notes for 2.16.19

Change-Id: I26501aaa5c3201607682079958a85fb6a2327acd
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
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--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -620,6 +620,49 @@
 
 ## Bugfix Releases
 
+### 2.16.19 (in development)
+
+* Bug Fixes
+
+  * [Issue 12606](https://bugs.chromium.org/p/gerrit/issues/detail?id=12606):
+  Fix `visibleto` predicate for groups.
+
+    If a group name was used in the `visibleto` predicate, changes were
+    not returned even if the group had permission to see them.
+
+  * [Issue 12646](https://bugs.chromium.org/p/gerrit/issues/detail?id=12646):
+  Fix incorrect highlighting of diffs in the GWT UI.
+
+    In some cases the highlighting was shown on an adjacent line rather than
+    on the line that was actually changed. This happened in both the side-by-side
+    and unified diff views in the GWT UI.
+
+  * [Issue 12667](https://bugs.chromium.org/p/gerrit/issues/detail?id=12667):
+  Fix unwanted expansion of common lines at the bottom of a diff in the GWT UI.
+
+  * Fix various misuses of the Flogger API causing exception details to be omitted
+  in the log output.
+
+    Exceptions were not properly passed to the logger which would cause the
+    details to be omitted, or in some cases the message "ERROR: UNUSED LOG ARGUMENTS"
+    to be emitted.
+
+    * When a project migration fails in the migration to schema 169
+    * When an invalid PAPE response is received during LDAP authentication
+    * When a plugin config is invalid and cannot be loaded
+    * When an error occurs while migrating a change metadata entry to JSON
+    * When there is an unsupported charset in a patch text
+
+* Replication Plugin Fixes
+
+  * Log when skipping deletion of a ref when pushing to a remote in mirror mode.
+
+  * Improve logging of push failures caused by a lock failure on the remote.
+
+* Library Upgrades
+
+  * Upgrade jackson-core to 2.11.0
+
 ### 2.16.18
 
 * Breaking Changes