phpMyAdmin monitor page not working

[jordvisser]

Problem/Motivation

phpMyAdmin frontend -> status page -> monitor page:
Does not work and returns a user-facing '500' error
Problem seems to be related to -> phpMyAdmin issue: Server status monitor not works #15897

Expected behavior

The monitor page to load and show graphs

Actual behavior

phpMyAdmin frontend return a 500 error

Steps to reproduce

Not sure, according to phpMyAdmin issue setting up a non-utf8 server connection should invoke to problem.
Make sure iconv is disabled OR not enabled in php configuration
Make sure php7x-iconv / php7-iconv is not installed on the system

Proposed changes

include apk add php7-iconv to the Dockerfile

[addons-assistant]

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[addons-assistant]

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