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io_monitor's Introduction

Hi! ๐Ÿ‘‹

My name is Dmitry and I'm a backend engineer focusing on Ruby, Rails, PostgreSQL and GraphQL. I prefer working on arhitectural, performance and developer experience (i.e., custom linters, CI actions, etc.) tasks. At my free time I'm playing with Go, Rust and Haskell.

I contribute to various openโ€“source projects (Ruby on Rails, graphql-ruby, GitLab, prism and many more). Also, I maintain my own libraries โ€” check them out pinned right below.

Featured articles and conference talks:

You can find me on Twitter and LinkedIn.

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io_monitor's Issues

Provide initial implementation

More details on Cult.

We need to implement a module that patches controller actions to measure database and HTTP response payload:

 class ReportController < ApplicationController
   include IoToResponsePayloadRatio::Controller

   def monthly_transaction_sum
     sum = Transactions.where(date: Date.current.all_month).sum(&:amount)
     render json: { sum: sum }
   end
 end

It can help find possible memory bloats earlier. These measurements can be sent to Rails logs or published as notification events. For instance, log could look like this:

Completed 200 OK in 1232ms (ActiveRecord: 400ms, DB Payload: 10kB, Body: 1kB, Allocations: 213223)

undefined method `body` and `code` for nil

I believe since the response is nil.. then open-uri tries to call resp.code which does not work

image

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

Allocations missing in ActiveSupport notifications

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!

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