Official oracle mysql repo for mysql-server creates file /usr/my.cnf

That overrides default /etc/mysql/my.cnf parameters
Now if this file exists it bacame managed and empty

mysql/files/usr-my.cnf

@@ -0,0 +1,7 @@
+# DO NOT CHANGE THIS FILE!
+# This config is generated by SALTSTACK
+# and all change will be overrided on next salt call
+#
+# this file was created by mysql-server package
+# and replaced with saltstack
+# to prevent default my.cnf parameters overriding

mysql/server.sls

@@ -78,3 +78,14 @@ mysql_config:
     - group: root
     - mode: 644
     {% endif %}
+
+# official oracle mysql repo
+# creates this file, that rewrites /etc/mysql/my.cnf setting
+# so, make it empty
+mysql_additional_config:
+  file.managed:
+    - name: /usr/my.cnf
+    - source: salt://mysql/files/usr-my.cnf
+    - create: False
+    - watch_in:
+      - service: mysqld