Just same as:
https://bugs.alpinelinux.org/issues/8780
When installing php7 libraries from Alpine 3.10 repositories, you get errors like:

<code class="c">
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php7/modules/pdo_mysql.so' - Error relocating /usr/lib/php7/modules/pdo_mysql.so: mysqlnd_allocator: symbol not found in Unknown on line 0
</code>

As a result, php7.2 alpine docker images are now useless:
https://github.com/docker-library/php/blob/66234ccc01849f2ce1a6b18428d4a7215921d647/7.2/alpine3.10/fpm/Dockerfile
This is why I see it as high priority.

(from redmine: issue id 10672, created on 2019-07-11, closed on 2019-07-11)