I would like to install Prometheus on port 8080 instead of 9090 (its normal default). To this end I have edited /etc/systemd/system/prometheus.service to conta
/etc/systemd/system/prometheus.service
The quotes were superfluous. This line will work:
ExecStart=/usr/local/bin/prometheus \ --config.file=/etc/prometheus.yaml --web.enable-admin-api \ --web.listen-address=:8080