Replace telegraf with node exporter

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/docker/prometheus-fail2ban-exporter/entrypoint.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+mkdir -p /tmp
+LOG_PIPE="$(mktemp -u)"
+mkfifo "$LOG_PIPE"
+
+(
+  while IFS= read -r line; do
+    if echo "$line" | grep -qEi "WARN|ERROR|FATAL"; then
+      echo "$line" >&2
+    else
+      echo "$line"
+    fi
+  done < "$LOG_PIPE"
+) &
+LOG_PID=$!
+
+trap 'kill $LOG_PID' EXIT
+
+exec /bin/prometheus-fail2ban-exporter "$@" > "$LOG_PIPE" 2>&1