Telegraf configuration changes

- Added shellscript for custom metrics - external IP & Temp
- Bumped Telegraf version #

templates/telegraf/custom_metrics.conf.j2

@@ -0,0 +1,5 @@
+[[inputs.exec]]
+  commands = ["/usr/local/bin/telegraf_custom_metrics.sh"]
+  timeout = "5s"
+  name_suffix = "_homelab_metrics"
+  data_format = "influx"

templates/telegraf/temperature.conf.j2

@@ -1,10 +0,0 @@
-[[inputs.exec]]
-{% if 'pis' in group_names %}
-  commands = ["cat /sys/class/thermal/thermal_zone0/temp"]
-{% elif 'macs' in group_names %}
-  commands = ["${HOME}/dotfiles-private/config/telegraf/cputemp.sh"]
-{% endif %}
-  timeout = "5s"
-  name_suffix = "_cpu_temp"
-  data_format = "value"
-  data_type = "integer"