Update 2.16.19 release notes

Change-Id: Ib055e8d26009e1f83ac224cc485ed57783545093
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index 9688c10..1fe5c3a 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -622,8 +622,25 @@
 
 ### 2.16.19 (in development)
 
+* New Features
+
+  * Enable to run online noteDb migration using multiple threads.
+
+    The new configuration option `notedb.onlineMigrationThreads` allows
+    tuning the number of threads the migration can use.
+
+    This helps to speedup online migration at the expense of imposing a
+    higher load on the Gerrit server running at the same time.
+
 * Bug Fixes
 
+  * [Issue 12637](https://bugs.chromium.org/p/gerrit/issues/detail?id=12637):
+  Fix SQL connection timeout during migration to schema 146 and 154.
+
+    A full GC is run at the beginning of the migration, after every 100k
+    accounts, and at the end of the migration. Additionally, bitmap index
+    generation is disabled during the migration.
+
   * [Issue 12606](https://bugs.chromium.org/p/gerrit/issues/detail?id=12606):
   Fix `visibleto` predicate for groups.
 
@@ -640,6 +657,14 @@
   * [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.
 
+  * Accept `--ownedby` as an alias of `--owned-by` in the groups REST API.
+
+    The option was incorrectly documented as `--ownedBy` which resulted in an
+    error "not a valid option" if anyone tried to use it.
+
+    The documentation is fixed, and `--ownedBy` is added as an alias so that it
+    also works for anyone still referring to the old documentation.
+
   * Fix various misuses of the Flogger API causing exception details to be omitted
   in the log output.
 
@@ -653,8 +678,23 @@
     * When an error occurs while migrating a change metadata entry to JSON
     * When there is an unsupported charset in a patch text
 
+  * [Issue 12673](https://bugs.chromium.org/p/gerrit/issues/detail?id=12673):
+  Fix emitting debug logs while running tests.
+
 * Replication Plugin Fixes
 
+  * [Issue 12678](https://bugs.chromium.org/p/gerrit/issues/detail?id=12678):
+  Fix missing replication Id in replication logs.
+
+    The migration to use Flogger in 2.16.17 caused a regression in the logging,
+    where the replication Id was omitted from the logs. This is fixed by reverting
+    back to slf4j logging for the replication log.
+
+  * [Issue 12719](https://bugs.chromium.org/p/gerrit/issues/detail?id=12719):
+  Fix `start --wait` to track in-flight collisions and to not fail.
+
+  * Fix URL matching to match real URLs in addition to templated URLs.
+
   * 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.