Allocations missing in ActiveSupport notifications

[vitobotta]

Hi! Thanks for this very useful gem. I see stats about allocations in the logs but not in the AS notification.

for example in the logs I see:

Completed 200 OK in 20638ms (Views: 14986.2ms | Flexirest: 0.0ms for 0 calls | ActiveRecord: 4770.2ms | ActiveRecord Payload: 1.14 MB | NetHttp Payload: 0 Bytes | Redis Payload: 0 Bytes | Response Payload: 1.2 MB | Allocations: 16348844)

but in the notification I see:

{:controller=>"Api::Integration::Events::InvitesController", :action=>"index", :method=>"GET", :status=>200, :view_runtime=>14986.230043135583, :db_runtime=>4770.207956790924, :path=>"/api/blendr/organizations/562/events/6069/invites", :active_record=>1197902, :net_http=>0, :redis=>0, :response=>1256895}

I am trying to export these metrics to prometheus to find out which endpoints use most allocations.

How can I add that info to the AS notification?

This is what I am doing now:

IoMonitor.configure do |config|
  config.publish = [:logs, :notifications] # defaults to :logs
  config.warn_threshold = 0.8 # defaults to 0
  config.adapters = [:active_record, :net_http, :redis] # defaults to [:active_record]
end

# if Rails.env.production?
  require 'prometheus_exporter/client'

  ActiveSupport::Notifications.subscribe("process_action.action_controller") do |name, start, finish, id, payload|
    io_monitor = payload[:io_monitor] || {}# { active_record: 866, response: 25 }

    metrics = payload.slice(:controller, :action, :method, :status, :view_runtime, :db_runtime, :path).merge(io_monitor)

    p metrics

    # PrometheusExporter::Client.default.send_json(type: "io_monitor", **metrics)
  end

Thanks!

[DmitryTsepelev]

Hi @vitobotta! The gem sends the notification with the name warn_threshold_reached.io_monitor and the ratio in the payload. Looks like you're subscribing to the event sent by Rails itself.

[vitobotta]

Aha!!! Will give that a try. Thanks!