$ apt search wmf-mariadb
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wmf-mariadb101/stretch-wikimedia 10.1.44-1 amd64
  MariaDB 10.1 with Wikimedia-specific patches.

wmf-mariadb101-client/stretch-wikimedia,now 10.1.44-1 amd64 [installed]
  MariaDB 10.1 client only with Wikimedia-specific patches.

wmf-mariadb103/stretch-wikimedia 10.3.8-2 amd64
  MariaDB plus patches.

wmf-mariadb103-client/stretch-wikimedia 10.3.8-1 amd64
  MariaDB 10.3 client only with Wikimedia-specific patches.