adding node exporter, loki, and promtail

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

@@ -0,0 +1,11 @@
+#!/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

@@ -0,0 +1,46 @@
+#!/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[@]}"