Extra copy of telegraf daemon

[Stuart Bishop]

There seem to be two telegraf daemons running after deployment. I think one gets started when the package is installed and is never shut down.

[Tejeev Patel (tejeevpatel)]

We've seen two possible occurrences of this same issue.

Both alerted due to zombie processes via Nagios/Pager Duty but on investigation it looks like both times, we found two telegraf processes running. Both processes had zombie children in today's event.

The first time was on 2016-10-12 where we also saw that it had just upgraded (according to apt logs), but this time there was no associated upgrade.

We worked around it by kill -15 'ing the parent processes and starting one back up.

[Diko Parvanov (dparv)]

Tried to reproduce on juju 2.7.1 with telegraf revision 30 on bionic of the charm and there is no duplicate daemon. (installed telegraf version is 1.12.6+git-b1a0a69~201911221541~ubuntu18.04.1).