T5152: Get default hostname for telegraf from FQDN or hostname

Fix for Telegraf agent hostname isn't qualified
Try to get the hostname from FQDN and then from the hostname
Used for metrics
You may have more than one machine with different domain names
r1 domain-name foo.local, hostname myhost
r2 domain-name bar.local, hostname myhost

It helps to detect from which exactly host we get metrics for
InfluxDB2

1 files changed, 11 insertions, 1 deletions

diff --git a/src/conf_mode/service_monitoring_telegraf.py b/src/conf_mode/service_monitoring_telegraf.py
index a71565df4..e816bbe8a 100755
--- a/src/conf_mode/service_monitoring_telegraf.py
+++ b/src/conf_mode/service_monitoring_telegraf.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2021-2022 VyOS maintainers and contributors
+# Copyright (C) 2021-2023 VyOS maintainers and contributors
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 or later as
@@ -15,6 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import os
+import socket
 import json
 
 from sys import exit
@@ -77,6 +78,14 @@ def get_nft_filter_chains():
     return chain_list
 
 
+def get_hostname() -> str:
+    try:
+        hostname = socket.getfqdn()
+    except socket.gaierror:
+        hostname = socket.gethostname()
+    return hostname
+
+
 def get_config(config=None):
 
     if config:
@@ -96,6 +105,7 @@ def get_config(config=None):
     monitoring = dict_merge(default_values, monitoring)
 
     monitoring['custom_scripts_dir'] = custom_scripts_dir
+    monitoring['hostname'] = get_hostname()
     monitoring['interfaces_ethernet'] = get_interfaces('ethernet', vlan=False)
     monitoring['nft_chains'] = get_nft_filter_chains()