zookeeper: when no servers specified, doesn't collect statistics

[smalenfant]

Directions

Bug report

Enable the input only with [[inputs.zookeeper]] doesn't collect any statistics

Relevant telegraf.conf:

[[inputs.zookeeper]]

System info:

Centos 7.3, telegraf 1.2.1

Steps to reproduce:

telegraf --test --config /etc/telegraf/telegraf.conf --config-directory /etc/telegraf/telegraf.d --input-filter zookeeper

Expected behavior:

Input to provide collection for zookeeper on localhost when there is no servers specified.

Actual behavior:

[root@zookeeper01~]# telegraf --test --config /etc/telegraf/telegraf.conf --config-directory /etc/telegraf/telegraf.d --input-filter zookeeper
* Plugin: inputs.zookeeper, Collection 1

Additional info:

Proposal:

Current behavior:

According to documentation (at least the way I read it), servers parameter seems optional and would use localhost:2181.

Desired behavior:

With simple input configured, zookeeper collection would start on localhost. This is what most input plugins works.

Use case: [Why is this important (helps with prioritizing requests)]

Workaround is fairly easy, specify servers = [":2181"]