Init file for Prometheus Alertmanager for RHEL 5 or 6

alertmanager

#!/bin/bash
#
# /etc/rc.d/init.d/alertmanager
#
# Alertmanager for Prometheus.
#
#  chkconfig: 2345 20 80 Read
#  description: Alertmanager for Prometheus.
#  processname: alertmanager

# Source function library.
. /etc/rc.d/init.d/functions

PROGNAME=alertmanager
PROG=/usr/local/bin/$PROGNAME
USER=prometheus
LOGFILE=/var/log/prometheus/alertmanager.log
LOCKFILE=/var/run/$PROGNAME.pid
CONFIG_FILE=/etc/prometheus/alertmanager.conf
SILENCES_FILE=/var/data/alertmanager-silences.json

start() {
    echo -n "Starting $PROGNAME: "
    daemon --user $USER --pidfile="$LOCKFILE" "$PROG -config.file $CONFIG_FILE -silences.file $SILENCES_FILE &>$LOGFILE &"
    echo $(pidofproc $PROGNAME) >$LOCKFILE
    echo
}

stop() {
    echo -n "Shutting down $PROGNAME: "
    killproc $PROGNAME
    rm -f $LOCKFILE
    echo
}

case "$1" in
    start)
    start
    ;;
    stop)
    stop
    ;;
    status)
    status $PROGNAME
    ;;
    restart|reload)
    stop
    start
    ;;
    *)
        echo "Usage: <servicename> {start|stop|status|reload|restart}"
        exit 1
    ;;
esac

and - CONFIG_FILE - extension must be .yml, not conf

Oops, dropped comment
Fix for latest alertmanager:
line 24 - replace -config to --config, remove -silences.file $SILENCES_FILE, add --storage.path=/var/lib/prometheus/alertmanager