You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: app.rb
    path of file: ./repos/ruby-docs-samples/appengine/standard-analytics
    
    the code of the file until where you have to start completion: # Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing
    
def track_event category, action, label, value
  # Anonymous Client ID.
  # Ideally, this should be a UUID that is associated
  # with particular user, device, or browser instance.
  client_id = "555"

  Net::HTTP.post_form(
    URI("http://www.google-analytics.com/collect"),
    v:   "1",             # API Version
    tid: GA_TRACKING_ID,  # Tracking ID / Property ID
    cid: client_id,       # Client ID
    t:   "event",         # Event hit type
    ec:  category,        # Event category
    ea:  action,          # Event action
    el:  label,           # Event label
    ev:  value            # Event value
  )
end