It looks like newer versions of alertmanager require command line options for start parameters to be in '--' format and not '-' as the current template defines. The latter produces an error on service startup with 'alertmanager: error: unknown short flag '-l', try --help'. Could you please revise chef-prometheus/templates/default/systemd/alertmanager.service.erb to reflect this requirement?
It looks like newer versions of alertmanager require command line options for start parameters to be in '--' format and not '-' as the current template defines. The latter produces an error on service startup with 'alertmanager: error: unknown short flag '-l', try --help'. Could you please revise chef-prometheus/templates/default/systemd/alertmanager.service.erb to reflect this requirement?