diff --git a/.github/semantic.yml b/.github/semantic.yml
new file mode 100644
index 00000000..e1e53bc1
--- /dev/null
+++ b/.github/semantic.yml
@@ -0,0 +1,13 @@
+# Always validate the PR title AND all the commits
+titleAndCommits: true
+
+# Allow use of Merge commits (eg on github: "Merge branch 'master' into feature/ride-unicorns")
+# this is only relevant when using commitsOnly: true (or titleAndCommits: true)
+allowMergeCommits: true
+
+# Allow use of Revert commits (eg on github: "Revert "feat: ride unicorns"")
+# this is only relevant when using commitsOnly: true (or titleAndCommits: true)
+allowRevertCommits: true
+
+# For allowed PR types: https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json
+# Tool Reference: https://github.com/zeke/semantic-pull-requests
diff --git a/bench/playbooks/roles/mariadb/tasks/main.yml b/bench/playbooks/roles/mariadb/tasks/main.yml
index 1f119005..8079583d 100644
--- a/bench/playbooks/roles/mariadb/tasks/main.yml
+++ b/bench/playbooks/roles/mariadb/tasks/main.yml
@@ -48,6 +48,10 @@
       [mysqld]
       pid-file        = /var/run/mysqld/mysqld.pid
       socket          = /var/run/mysqld/mysqld.sock
+
+      # setting appeared inside mysql but overwritten by mariadb inside mariadb.conf.d/xx-server.cnf valued as utf8mb4_general_ci
+
+      collation-server = utf8mb4_unicode_ci
     create: yes
   become: yes
   become_user: root