Zookeeper stats are not collected if first node fails

[sybrandy]

Bug report

If the first Zookeeper node in the service is down, no Zookeeper stats are collected.

Relevant telegraf.conf:

[[inputs.zookeeper]]
servers = ["server1", "server2", "server3"]

System info:

• Telegraph 1.1.1-alpine container
• 3 node zookeeper cluster

Steps to reproduce:

1. Start zookeeper cluster
2. Start telegraph and have output sent to
3. Stop the first zookeeper node in the config.

Expected behavior:

Metrics are still collected even though one of the nodes is down.

Actual behavior:

No metrics are collected.

Additional info:

Relevant log line:
E! ERROR in input [inputs.zookeeper]: dial tcp <ip_address>:2181 getsockopt: connection refused

[danielnelson]

This bug was fixed in #2372, included in Telegraf 1.3.0