OpencensusPhoenix

Phoenix has abandoned instrumenters in 1.5 in favour of the :telemetry library. The following approach should work with all versions of Phoenix.

Simply ensure that the following code runs while your app is starting up (eg, in the Application.start/2 callback):

# lib/my_app_web/endpoint.ex check this file for the event_prefix
defmodule MyAppWeb.Endpoint do
  ...
  plug Plug.Telemetry, event_prefix: [:my_app, :endpoint]
  ...
end

# lib/my_app/application.ex, add this line using event_prefix from above:
def start(_type, _args) do
  ...
  OpencensusPhoenix.Telemetry.setup()
  ...
end

Phoenix <=1.4 only

Phoenix instrumenter callback module to automatically create OpenCensus spans for Phoenix Controller and View information.

Simply configure your Phoenix Endpoint to use this library as one of its instrumenters:

config :my_app, MyAppWeb.Endpoint,
  # ... existing config ...
  instrumenters: [OpencensusPhoenix.Instrumenter]

Resource Names

Prior to Phoenix 1.4, the "route info" was not available to plugs. As such instead of using the http route as the resource name, we use the controller + action combination. For example:

• Pre 1.4: MyApp.Posts.index
• Version 1.4 or greater: /posts