The following exception is being recurringly thrown by /usr/lib/ganglia/python_modules/varnishkafka.py:
Dec 01 11:53:45 cp4008 gmond[18667]: [PYTHON] Can't call the metric handler function for [kafka.rdkafka.brokers.kafka1012-eqiad-wmnet:9092.12.rtt.cnt] in the python module [varnishkafka]. Dec 01 11:53:45 cp4008 gmond[18667]: Traceback (most recent call last): Dec 01 11:53:45 cp4008 gmond[18667]: File "/usr/lib/ganglia/python_modules/varnishkafka.py", line 346, in metric_handler Dec 01 11:53:45 cp4008 gmond[18667]: varnishkafka_stats.update_stats() Dec 01 11:53:45 cp4008 gmond[18667]: File "/usr/lib/ganglia/python_modules/varnishkafka.py", line 264, in update_stats Dec 01 11:53:45 cp4008 gmond[18667]: if self.have_stats_changed_since_last_update(): Dec 01 11:53:45 cp4008 gmond[18667]: File "/usr/lib/ganglia/python_modules/varnishkafka.py", line 316, in have_stats_changed_since_last_update Dec 01 11:53:45 cp4008 gmond[18667]: if self.flattened_stats[key] != self.flattened_stats_previous[key]: Dec 01 11:53:45 cp4008 gmond[18667]: KeyError: 'kafka.varnishkafka.time'
Except for the problem itself, this might easily cause disk space issues by flooding /var/log/daemon.log, the exception is reported *very* frequently.