From 30d6bcf525cd43d09dde56b96ae6d4414b75439c Mon Sep 17 00:00:00 2001
From: Jeremy Prevost <JPrevost@users.noreply.github.com>
Date: Tue, 17 Sep 2024 08:34:59 -0400
Subject: [PATCH] ScoutAPM

https://mitlibraries.atlassian.net/browse/TCO-87
---
 Gemfile              |  6 ++++++
 Gemfile.lock         |  4 ++++
 README.md            |  6 ++++++
 config/scout_apm.yml | 49 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 65 insertions(+)
 create mode 100644 config/scout_apm.yml

diff --git a/Gemfile b/Gemfile
index abc2c57..dfccc70 100644
--- a/Gemfile
+++ b/Gemfile
@@ -34,9 +34,15 @@ gem 'omniauth'
 gem 'omniauth_openid_connect'
 gem 'omniauth-rails_csrf_protection'
 
+# Parser added explicitly to allow for the namespace to be available for scout
+gem 'parser'
+
 # Use the Puma web server [https://github.com/puma/puma]
 gem 'puma', '>= 5.0'
 
+# Performance Monitoring
+gem 'scout_apm'
+
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem 'rails', '~> 7.1.2'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index cf474e6..7b15579 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -383,6 +383,8 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
+    scout_apm (5.4.0)
+      parser
     selectize-rails (0.12.6)
     selenium-webdriver (4.23.0)
       base64 (~> 0.2)
@@ -481,6 +483,7 @@ DEPENDENCIES
   omniauth
   omniauth-rails_csrf_protection
   omniauth_openid_connect
+  parser
   pg
   puma (>= 5.0)
   rack-cors
@@ -491,6 +494,7 @@ DEPENDENCIES
   rubocop-minitest
   rubocop-performance
   rubocop-rails
+  scout_apm
   selenium-webdriver
   simplecov
   simplecov-lcov
diff --git a/README.md b/README.md
index 3bb7a76..d312f73 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,12 @@ If you need to regenerate these cassettes, the following procedure should be suf
 `PLATFORM_NAME`: The value set is added to the header after the MIT Libraries logo. The logic and CSS for this comes
 from our theme gem.
 
+Scout settings can be controlled via `config/scout_apm.yml` or ENV. ENV overrides config.
+Lots more [Scout settings](https://scoutapm.com/docs/ruby/configuration#environment-variables) available.
+`SCOUT_KEY`: ScoutAPM key. Do not set in dev or test.
+`SCOUT_LOG_LEVEL`: defaults to INFO which is probably fine. Controls verboseness of Scout logs
+`SCOUT_NAME`: set a unique name per deployed tier to avoid confusion.
+
 ### Authentication
 
 #### Required in all environments
diff --git a/config/scout_apm.yml b/config/scout_apm.yml
new file mode 100644
index 0000000..9bf7299
--- /dev/null
+++ b/config/scout_apm.yml
@@ -0,0 +1,49 @@
+# This configuration file is used for Scout APM.
+# Environment variables can also be used to configure Scout. See our help docs at https://scoutapm.com/docs/ruby/configuration#environment-variables for more information.
+common: &defaults
+
+  # key: Your Organization key for Scout APM. Found on the settings screen.
+  # - Default: none
+  # key: We set this ENV `SCOUT_KEY`
+
+  # log_level: Verboseness of logs.
+  # - Default: 'info'
+  # - Valid Options: debug, info, warn, error
+  # log_level: debug
+  # TIP: this can be set via ENV `SCOUT_LOG_LEVEL` to change without redeploy
+
+  # use_prepend: Use the newer `prepend` instrumentation method. In some cases, gems
+  #              that use `alias_method` can conflict with gems that use `prepend`.
+  #              To avoid the conflict, change this setting to match the method
+  #              that the other gems use.
+  #              If you have another APM gem installed, such as DataDog or NewRelic,
+  #              you will likely want to set `use_prepend` to true.
+  #
+  #              See https://scoutapm.com/docs/ruby/configuration#library-instrumentation-method
+  #              for more information.
+  # - Default: false
+  # - Valid Options: true, false
+  # use_prepend: true
+
+  # name: Application name in APM Web UI
+  # - Default: the application names comes from the Rails or Sinatra class name
+  # name:
+
+  # monitor: Enable Scout APM or not
+  # - Default: none
+  # - Valid Options: true, false
+  monitor: true
+
+production:
+  <<: *defaults
+
+development:
+  <<: *defaults
+  monitor: false
+
+test:
+  <<: *defaults
+  monitor: false
+
+staging:
+  <<: *defaults