New Script: Prometheus Alertmanager (#1272)

* New Script: Prometheus Alertmanager

* Alertmanager: Append v before Release-Version

* Alertmanager: Switch to `/opt` before updating release

* Alertmanager: Split `var_tags` by `;`

* Alertmanager: Change installation of curl, sudo and mc to a oneliner

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Alertmanager: Set correct copyright

* Alertmanager: Change the way how the systemd unit file is written to disk

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>

* Alertmanager: Changed the way on how we move and delete files

* Alertmanager: Make files executable

* Alertmanager: Set correct license and source header

* Update prometheus-alertmanager.json

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>
Co-authored-by: CanbiZ <47820557+MickLesk@users.noreply.github.com>

install/prometheus-alertmanager-install.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2021-2025 community-scripts ORG
+# Author: Andy Grunwald (andygrunwald)
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://prometheus.io/
+
+source /dev/stdin <<< "$FUNCTIONS_FILE_PATH"
+color
+verb_ip6
+catch_errors
+setting_up_container
+network_check
+update_os
+
+msg_info "Installing Dependencies"
+$STD apt-get install -y \
+  curl \
+  sudo \
+  mc
+msg_ok "Installed Dependencies"
+
+msg_info "Installing Prometheus Alertmanager"
+RELEASE=$(curl -s https://api.github.com/repos/prometheus/alertmanager/releases/latest | grep "tag_name" | awk '{print substr($2, 3, length($2)-4) }')
+mkdir -p /etc/alertmanager
+mkdir -p /var/lib/alertmanager
+wget -q https://github.com/prometheus/alertmanager/releases/download/v${RELEASE}/alertmanager-${RELEASE}.linux-amd64.tar.gz
+tar -xf alertmanager-${RELEASE}.linux-amd64.tar.gz
+mv alertmanager-${RELEASE}.linux-amd64/alertmanager alertmanager-${RELEASE}.linux-amd64/amtool /usr/local/bin/
+mv alertmanager-${RELEASE}.linux-amd64/alertmanager.yml /etc/alertmanager/alertmanager.yml
+echo "${RELEASE}" >/opt/${APPLICATION}_version.txt
+msg_ok "Installed Prometheus Alertmanager"
+
+msg_info "Creating Service"
+cat <<EOF >/etc/systemd/system/prometheus-alertmanager.service
+echo "[Unit]
+Description=Prometheus Alertmanager
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=root
+Restart=always
+Type=simple
+ExecStart=/usr/local/bin/alertmanager \
+    --config.file=/etc/alertmanager/alertmanager.yml \
+    --storage.path=/var/lib/alertmanager/ \
+    --web.listen-address=0.0.0.0:9093
+ExecReload=/bin/kill -HUP \$MAINPID
+
+[Install]
+WantedBy=multi-user.target"
+EOF
+systemctl enable -q --now prometheus-alertmanager
+msg_ok "Created Service"
+
+motd_ssh
+customize
+
+msg_info "Cleaning up"
+$STD apt-get -y autoremove
+$STD apt-get -y autoclean
+rm -rf alertmanager-${RELEASE}.linux-amd64 alertmanager-${RELEASE}.linux-amd64.tar.gz
+msg_ok "Cleaned"