Httpjson

[jpalay]

httpjson is a plugin that polls servers, then passes along their JSON responses to an Accumulator. This is useful for gathering metrics from preexisting web services that return information about other services in JSON form.

To use it, in the telegraf configuration file, define a list of httpjson Services, which are essentially clusters of servers to poll. Each Service has a name, an HTTP method (GET, POST, etc.), a toml table of HTTP parameters to attach to the request, and a list of endpoints to hit.

When the plugin runs, it sends all the HTTP requests for all the various endpoints it needs to hit. It then takes the JSON response from each request, flattens it, and then passes each float value along to the Accumulator. The measurement name httpjson chooses for each float value is in the form <service-name>_<grandparent-key>_<parent-key>_<child-key>. It also tags each measurement with the name of the endpoint it hits.

Let me know what your thoughts are!

[sparrc]

This looks good, thanks @jpalay and @alvaromorales !

[sparrc]

This has been merged via rebase, thanks again!