Telegraf: Add Consul catalog metrics

[panda87]

Consul catalog including the agents state and services state and gives the ability to monitor the name of the server as well as the name of the services healths.

Thanks

[robinpercy-xm]

@sparrc: I'm happy to take this one on, since we also need something similar at work.

[sparrc]

@robinpercy-xm sure, that'd be great!

[robinpercy-xm]

@panda87 it looks like the consul plugin added by @harnash provides everything you mentioned. Was there anything else you were looking for?

https://github.com/influxdata/telegraf/tree/master/plugins/inputs/consul

[oryband]

@robinpercy-xm if you compare this input to consul-exporter, it fetches the catalog for _all services from the entire cluster_, not just local services.

Can this feature be added please? I'd rather not have to deploy two agents next to each other: telegraf and consul-exporter.

[harnash]

@oryband Thanks for the feedback. I'll look at consul-exporter and try to fill the missing parts. Hopefully this week.