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Add icinga/prometheus monitoring for multi-instance
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Description

Our current MariaDB monitoring works fine on hosts that have exactly one MariaDB instance running on port 3306 and /var/run/mysqld/mysqld.sock, but the new multi-instance servers have multiple instances running.

Icinga: ??
Prometheus: https://github.com/wikimedia/puppet/blob/1d0d25468c42ae154a4126cd75237b08ab12755d/modules/profile/manifests/prometheus/mysqld_exporter_instance.pp