MarsSeed [1] filed a deletion request for prometheus-mysqld-exporter- bin [2]:
Much newer version exists in [extra] repo: https://archlinux.org/packages/?q=prometheus-mysqld-exporter [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/prometheus-mysqld-exporter-bin/
