Remove NewRelic integration.

Remove the NewRelic integration in preparation for migrating to Elastic APM instead.

app/javascript/packs/application.js

@@ -59,7 +59,6 @@ import Upload from "../src/javascripts/uploads.js";
 import UserTooltip from "../src/javascripts/user_tooltips.js";
 import Utility from "../src/javascripts/utility.js";
 import Ugoira from "../src/javascripts/ugoira.js"
-import NewRelic from "../src/javascripts/new_relic.js";
 
 let Danbooru = {};
 Danbooru.Autocomplete = Autocomplete;
@@ -87,7 +86,6 @@ Danbooru.Upload = Upload;
 Danbooru.UserTooltip = UserTooltip;
 Danbooru.Utility = Utility;
 Danbooru.Ugoira = Ugoira;
-Danbooru.NewRelic = NewRelic;
 
 Danbooru.notice = Utility.notice;
 Danbooru.error = Utility.error;

app/javascript/src/javascripts/new_relic.js

@@ -1,14 +0,0 @@
-class NewRelic {
-  static initialize_all() {
-    /* https://docs.newrelic.com/docs/browser/new-relic-browser/browser-agent-spa-api/setcustomattribute-browser-agent-api/ */
-    if (typeof window.newrelic === "object") {
-      window.newrelic.setCustomAttribute("screenWidth", window.screen.width);
-      window.newrelic.setCustomAttribute("screenHeight", window.screen.height);
-      window.newrelic.setCustomAttribute("screenResolution", `${window.screen.width}x${window.screen.height}`);
-      window.newrelic.setCustomAttribute("devicePixelRatio", window.devicePixelRatio);
-    }
-  }
-}
-
-NewRelic.initialize_all();
-export default NewRelic;

app/logical/danbooru_logger.rb

@@ -1,27 +1,25 @@
 # frozen_string_literal: true
 
-# The DanbooruLogger class handles logging messages to the Rails log and to NewRelic.
+# The DanbooruLogger class handles logging messages to the Rails log and to the APM.
 #
 # @see https://guides.rubyonrails.org/debugging_rails_applications.html#the-logger
-# @see https://docs.newrelic.com
 class DanbooruLogger
   HEADERS = %w[referer sec-fetch-dest sec-fetch-mode sec-fetch-site sec-fetch-user]
 
-  # Log a message to the Rails log and to NewRelic.
+  # Log a message to the Rails log and to the APM.
+  #
   # @param message [String] the message to log
   # @param params [Hash] optional key-value data to log with the message
   def self.info(message, params = {})
     Rails.logger.info(message)
 
-    if defined?(::NewRelic)
-      params = flatten_hash(params).symbolize_keys
-      ::NewRelic::Agent.record_custom_event(:info, message: message, **params)
-    end
+    params = flatten_hash(params).symbolize_keys
+    log_event(:info, message: message, **params)
   end
 
-  # Log an exception to the Rails log and to NewRelic. The `expected` flag is
+  # Log an exception to the Rails log and to the APM. The `expected` flag is
   # used to separate expected exceptions, like search timeouts or auth failures,
-  # from unexpected exceptions, like runtime errors, in the NewRelic error log.
+  # from unexpected exceptions, like runtime errors, in the error logs.
   #
   # @param message [Exception] the exception to log
   # @param expected [Boolean] whether the exception was expected
@@ -34,12 +32,10 @@ class DanbooruLogger
       Rails.logger.error("#{exception.class}: #{exception.message}\n#{backtrace}")
     end
 
-    if defined?(::NewRelic)
-      ::NewRelic::Agent.notice_error(exception, expected: expected, custom_params: params)
-    end
+    log_exception(exception, expected: expected, custom_params: params)
   end
 
-  # Log extra HTTP request data to NewRelic. Logs the user's IP, user agent,
+  # Log extra HTTP request data to the APM. Logs the user's IP, user agent,
   # request params, and session cookies.
   #
   # @param request the HTTP request
@@ -84,15 +80,18 @@ class DanbooruLogger
   def self.add_attributes(prefix, hash)
     attributes = flatten_hash(hash).transform_keys { |key| "#{prefix}.#{key}" }
     attributes.delete_if { |key, value| key.end_with?(*Rails.application.config.filter_parameters.map(&:to_s)) }
-    add_custom_attributes(attributes)
+    log_attributes(attributes)
   end
 
   private_class_method
 
-  # @see https://docs.newrelic.com/docs/using-new-relic/data/customize-data/collect-custom-attributes/#ruby-att
-  def self.add_custom_attributes(attributes)
-    return unless defined?(::NewRelic)
-    ::NewRelic::Agent.add_custom_attributes(attributes)
+  def self.log_attributes(attributes)
+  end
+
+  def self.log_exception(exception, expected: false, custom_params: {})
+  end
+
+  def self.log_event(level, message: nil, **params)
   end
 
   # flatten_hash({ foo: { bar: { baz: 42 } } })

app/views/layouts/blank.html.erb

@@ -1,7 +1,6 @@
 <!doctype html>
 <html lang="en">
 <head>
-  <%= NewRelic::Agent.browser_timing_header rescue "" %>
   <meta charset="utf-8">
   <title><%= page_title %></title>
   <link rel="icon" href="/favicon.ico" sizes="16x16" type="image/x-icon">

app/views/layouts/default.html.erb

@@ -1,7 +1,6 @@
 <!doctype html>
 <html lang="en">
 <head>
-  <%= NewRelic::Agent.browser_timing_header rescue "" %>
   <meta charset="utf-8">
   <title><%= page_title %></title>