In this code line, url.Parse is used to parse the given host string. If this string does not contain a scheme (e.g. google.com instead of tcp://google.com), u.Host is an empty string and the connect fails.

Bug report

Relevant telegraf.conf:

[[outputs.opentsdb]]
 prefix = "telegraf."
 host = "google.com"
 port = 4242

System info:

• Telegraf version 1.1.2

Steps to reproduce:

Provide a host without a scheme to the OpenTSDB output plugin.

Expected behavior:

The plugin should be able connect to the host.

Actual behavior:

The connection fails with: Failed to connect to output opentsdb, retrying in 15s, error was 'OpenTSDB: Telnet connect fail'