Feature Request: Add collectd parser

[gunnaraasen]

Should be fairly straightforward to port the existing code from InfluxDB's collectd input service.

[sparrc]

since we already have the tcp_listener and udp_listener plugins, we should be able to just write a parser for the collectd format (https://github.com/influxdata/telegraf/tree/master/plugins/parsers)

[panda87]

We workaround it with graphite output from Collectd, and used UDP listener on the host with the latest template feature, and it works very well

[bfgoodrich]

I really like the idea of having a specific plugin for collectd

[danielnelson]

It won't be a whole input plugin, just a new parser to be used with socket_listener like this:

[[inputs.socket_listener]]
  service_address = "udp://127.0.0.1:25826"
  data_format = "collectd"
  name_prefix = "collectd_"

[danielnelson]

One limitation of this method is we can't support authentication, encryption, signing, or validation against a types database.

[danielnelson]

One limitation of this method is we can't support authentication, encryption, signing, or validation against a types database.

This is not correct, all of these can be supported via additional parser options:

  collectd_auth_file = "/etc/collectd/auth_file"
  collectd_security_level = "sign"
  collectd_typesdb = "/usr/share/collectd/types.db"

[danielnelson]

Implemented in #2654