release notes: document deprecated metrics

Signed-off-by: deepthi <[email protected]>
vitessio · Oct 31, 2023 · 3f40609 · 3f40609
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diff --git a/changelog/19.0/19.0.0/summary.md b/changelog/19.0/19.0.0/summary.md
@@ -12,6 +12,7 @@
 ### <a id="deprecations-and-deletions"/>Deprecations and Deletions
 
 - The `MYSQL_FLAVOR` environment variable is now removed from all Docker Images.
+- VTTablet metrics for TxThrottler's topology watchers have been deprecated. They will be deleted in the next release.
 
 ### <a id="docker"/>Docker