chrony: add multigraph plugin to monitor chrony's delay, freq time and stratum

plugins/chrony/chrony_multigraph

@@ -0,0 +1,101 @@
+#!/usr/bin/python3 -tt
+# -*- coding: utf-8 -*-
+
+"""Munin plugin to monitor chrony NTP daemon status.
+
+Copyright 2014, Kim B. Heino, b@bbbs.net, Foobar Oy
+License GPLv2+
+
+#%# capabilities=autoconf
+#%# family=auto
+"""
+
+import os
+import subprocess
+import sys
+
+
+FIELDS = {
+    'stratum': 'Stratum',
+    'systime': 'System time',
+    'delay': 'Root delay',
+    'frequency': 'Frequency',
+}
+
+
+def get_values():
+    """Run "chronyc tracking" and parse it's output.
+
+    Return: list of (label, value, description)
+    """
+    try:
+        output = subprocess.run(['/usr/bin/chronyc', 'tracking'],
+                                stdout=subprocess.PIPE, check=False,
+                                encoding='utf-8', errors='ignore')
+    except FileNotFoundError:
+        return {}
+    lines = output.stdout.splitlines()
+    ret = {}
+    for label in FIELDS:
+        for line in lines:
+            if line.startswith(FIELDS[label]):
+                value = float(line.split(':', 1)[1].split()[0])
+                if ' slow' in line:
+                    value = -value
+                ret[label] = value
+    return ret
+
+
+def config():
+    """Print plugin config."""
+    print('multigraph chrony_stratum')
+    print('graph_title Chrony stratum')
+    print('graph_vlabel stratum')
+    print('graph_category time')
+    print('graph_args --base 1000 --lower-limit 0')
+    print('stratum.label Stratum')
+    print('stratum.warning 1:9')
+
+    print('multigraph chrony_systime')
+    print('graph_title Chrony system time offset')
+    print('graph_vlabel seconds')
+    print('graph_category time')
+    print('graph_args --base 1000')
+    print('systime.label System time offset to NTP time')
+
+    print('multigraph chrony_delay')
+    print('graph_title Chrony network delay')
+    print('graph_vlabel seconds')
+    print('graph_category time')
+    print('graph_args --base 1000')
+    print('delay.label Network path delay')
+
+    print('multigraph chrony_frequency')
+    print('graph_title Chrony clock frequency error')
+    print('graph_vlabel ppm')
+    print('graph_category time')
+    print('graph_args --base 1000')
+    print('frequency.label Local clock frequency error')
+
+    if os.environ.get('MUNIN_CAP_DIRTYCONFIG') == '1':
+        fetch()
+
+
+def fetch():
+    """Print values."""
+    values = get_values()
+    for key in FIELDS:
+        print('multigraph chrony_{}'.format(key))
+        if key == 'stratum' and values[key] == 0:
+            print('{}.value U'.format(key))
+        else:
+            print('{}.value {:.8f}'.format(key, values[key]))
+
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1 and sys.argv[1] == 'autoconf':
+        print('yes' if get_values() else 'no')
+    elif len(sys.argv) > 1 and sys.argv[1] == 'config':
+        config()
+    else:
+        fetch()