adding node exporter, loki, and promtail

addon-prometheus/rootfs/etc/cont-init.d/prometheus.sh

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+#!/command/with-contenv bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus
+# Configures Prometheus
+# ==============================================================================
+echo "${SUPERVISOR_TOKEN}" > '/run/home-assistant.token'
+
+mkdir -p /data/prometheus
+find /data/prometheus -not -perm 0644 -type f -exec chmod 0660 {} \;
+find /data/prometheus -not -perm 0755 -type d -exec chmod 0770 {} \;
+chown -R prometheus:prometheus /data/prometheus

addon-prometheus/rootfs/etc/prometheus/prometheus.yml

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+---
+# my global config
+global:
+  scrape_interval: 15s  # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s  # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets:
+        #  - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  - "/share/prometheus/rules/*.yml"
+  - "/share/prometheus/rules/*.yaml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: "prometheus"
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+      - targets: ["localhost:9090"]
+  - job_name: "home-assistant"
+    scrape_interval: 60s
+    metrics_path: /core/api/prometheus
+
+    # Long-Lived Access Token
+    bearer_token_file: "/run/home-assistant.token"
+
+    scheme: http
+    static_configs:
+      - targets: ["supervisor:80"]

addon-prometheus/rootfs/etc/services.d/prometheus-configgen/finish

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+#!/command/with-contenv bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus
+# Take down the S6 supervision tree when Prometheus fails
+# ==============================================================================
+if [[ "${1}" -ne 0 ]] && [[ "${1}" -ne 256 ]]; then
+  bashio::log.warning "Prometheus config crashed, halting add-on"
+  exec /run/s6/basedir/bin/halt
+fi
+
+bashio::log.info "Prometheus config stopped, restarting..."

addon-prometheus/rootfs/etc/services.d/prometheus-configgen/run

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+#!/command/with-contenv bashio
+bashio::log.info 'Starting prometheus config generator...'
+
+if ! bashio::fs.directory_exists /share/prometheus/targets; then
+  mkdir -p /share/prometheus/targets
+  chown -R prometheus:prometheus /share/prometheus/targets
+fi
+
+cd /opt/prometheus-configgen || bashio::exit.nok \
+  "Could not change working directory for prometheus-configgen."
+
+# Run Prometheus
+exec s6-setuidgid prometheus python3 combiner

addon-prometheus/rootfs/etc/services.d/prometheus/finish

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+#!/command/with-contenv bashio
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus
+# Take down the S6 supervision tree when Prometheus fails
+# ==============================================================================
+if [[ "${1}" -ne 0 ]] && [[ "${1}" -ne 256 ]]; then
+  bashio::log.warning "Prometheus crashed, halting add-on"
+  exec /run/s6/basedir/bin/halt
+fi
+
+bashio::log.info "Prometheus stopped, restarting..."

addon-prometheus/rootfs/etc/services.d/prometheus/run

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+#!/command/with-contenv bashio
+# shellcheck disable=SC2191
+# ==============================================================================
+# Home Assistant Community Add-on: Prometheus
+# Runs the Prometheus Server
+# ==============================================================================
+declare -a options
+declare name
+declare value
+
+bashio::log.info 'Starting prometheus...'
+
+options+=(--config.file="/etc/prometheus/prometheus.yml" )
+options+=(--storage.tsdb.path="/data/prometheus" )
+options+=(--web.console.libraries="/usr/share/prometheus/console_libraries" )
+options+=(--web.console.templates="/usr/share/prometheus/consoles" )
+options+=(--web.route-prefix="/" )
+options+=(--web.external-url="http://localhost:9090$(bashio::addon.ingress_entry)/" )
+options+=(--web.enable-lifecycle )
+
+# Load custom environment variables
+for var in $(bashio::config 'env_vars|keys'); do
+    name=$(bashio::config "env_vars[${var}].name")
+    value=$(bashio::config "env_vars[${var}].value")
+    bashio::log.info "Setting ${name} to ${value}"
+    export "${name}=${value}"
+done
+
+if ! bashio::fs.directory_exists /data/prometheus; then
+  mkdir -p /data/prometheus
+  chown prometheus:prometheus /data/prometheus
+fi
+
+if ! bashio::fs.directory_exists /share/prometheus/rules; then
+  mkdir -p /share/prometheus/rules
+  chown -R prometheus:prometheus /share/prometheus/rules
+fi
+
+if ! bashio::fs.directory_exists /share/prometheus/targets; then
+  mkdir -p /share/prometheus/targets
+  chown -R prometheus:prometheus /share/prometheus/targets
+fi
+
+yq -i eval-all '. as $item ireduce ({}; . * $item)' /etc/prometheus/prometheus.yml /share/prometheus/prometheus.yaml
+# Run Prometheus
+exec s6-setuidgid prometheus /usr/local/bin/prometheus "${options[@]}"