This Kong plugin is intended for SignalFx users to obtain performance metrics from their Kong deployments for aggregation and reporting via the Smart Agent or the collectd-kong collectd plugin. It works similarly to other Kong logging plugins and provides connection state and request/response count, latency, status, and size metrics available through a /signalfx Admin API endpoint.


Terminology

  • plugin: a plugin executing actions inside Kong before or after a request has been proxied to the upstream API.
  • Service: the Kong entity representing an external upstream API or microservice.
  • Route: the Kong entity representing a way to map downstream requests to upstream services.
  • Consumer: the Kong entity representing a developer or machine using the API. When using Kong, a Consumer only communicates with Kong which proxies every call to the said upstream API.
  • Credential: a unique string associated with a Consumer, also referred to as an API key.
  • upstream service: this refers to your own API/service sitting behind Kong, to which client requests are forwarded.
  • API: a legacy entity used to represent your upstream services. Deprecated in favor of Services since CE 0.13.0 and EE 0.32.

Configuration

Enabling the plugin on a Service

Configure this plugin on a Service by making the following request:

$ curl -X POST http://kong:8001/services/{service}/plugins \
    --data "name=signalfx"  \
    --data "config.aggregate_by_http_method=true"

  • service: the id or name of the Service that this plugin configuration will target.

Enabling the plugin on a Route

Configure this plugin on a Route with:

$ curl -X POST http://kong:8001/routes/{route_id}/plugins \
    --data "name=signalfx"  \
    --data "config.aggregate_by_http_method=true"

  • route_id: the id of the Route that this plugin configuration will target.

Enabling the plugin on a Consumer

You can use the http://localhost:8001/plugins endpoint to enable this plugin on specific Consumers:

$ curl -X POST http://kong:8001/plugins \
    --data "name=signalfx" \
    --data "consumer_id={consumer_id}"  \
    --data "config.aggregate_by_http_method=true"

Where consumer_id is the id of the Consumer we want to associate with this plugin.

You can combine consumer_id and service_id

in the same request, to furthermore narrow the scope of the plugin.

Enabling the plugin on an API

If you are using an older version of Kong with the legacy API entity (deprecated in favor of Services since CE 0.13.0 and EE 0.32.), you can configure this plugin on top of such an API by making the following request:

$ curl -X POST http://kong:8001/apis/{api}/plugins \
    --data "name=signalfx"  \
    --data "config.aggregate_by_http_method=true"

  • api: either id or name of the API that this plugin configuration will target.

Global plugins

All plugins can be configured using the http://kong:8001/plugins/ endpoint. A plugin which is not associated to any Service, Route or Consumer (or API, if you are using an older version of Kong) is considered "global", and will be run on every request. Read the Plugin Reference and the Plugin Precedence sections for more information.

Parameters

Here's a list of all the parameters which can be used in this plugin's configuration:

form parameterdefaultdescription
nameThe name of the plugin to use, in this case signalfx
service_idThe id of the Service which this plugin will target.
route_idThe id of the Route which this plugin will target.
enabledtrueWhether this plugin will be applied.
consumer_idThe id of the Consumer which this plugin will target.
api_idThe id of the API which this plugin will target. Note: The API Entity is deprecated in favor of Services since CE 0.13.0 and EE 0.32.
config.aggregate_by_http_method

true

By default, metrics for each Service/API-fielded request cycle will be aggregated by a context determined partially by the request’s HTTP method and by its response’s status code. If you are monitoring a large infrastructure with hundreds of routes, grouping by HTTP method can be too granular or costly for performant ``/signalfx requests on a 1s interval, depending on the server resources. This context grouping can be disabled with the boolean configuration option aggregate_by_http_method`.

Installation and configuration

See details on https://github.com/signalfx/kong-plugin-signalfx and https://github.com/signalfx/collectd-kong.