Add lockfile (#32)

**Summary of changes:**
Commit lockfile previously ignored (see
https://bundler.io/guides/faq.html#using-gemfiles-inside-gems).

/task https://app.asana.com/0/0/1206244989881229/f

---------

Co-authored-by: Irving Caro <112433591+betterment-coding-agent@users.noreply.github.com>

.gitignore

@@ -4,7 +4,6 @@
 .DS_Store
 .rvmrc
 /coverage
-Gemfile.lock
 gemfiles/*.lock
 pkg/*
 *.sqlite

.rubocop.yml

@@ -16,3 +16,6 @@ AllCops:
 
 Rails/EnvironmentVariableAccess:
   Enabled: false
+
+RSpec/IndexedLet:
+  Enabled: false

Gemfile.lock

@@ -0,0 +1,129 @@
+PATH
+  remote: .
+  specs:
+    delayed (0.5.2)
+      activerecord (>= 5.2)
+      concurrent-ruby
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actionmailer (0.6.1)
+      actionpack (>= 0.9.5)
+    actionpack (1.4.0)
+    activejob (6.1.7.6)
+      activesupport (= 6.1.7.6)
+      globalid (>= 0.3.6)
+    activemodel (6.1.7.6)
+      activesupport (= 6.1.7.6)
+    activerecord (6.1.7.6)
+      activemodel (= 6.1.7.6)
+      activesupport (= 6.1.7.6)
+    activesupport (6.1.7.6)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
+    appraisal (2.5.0)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    ast (2.4.2)
+    betterlint (1.4.4)
+      rubocop (> 1.0)
+      rubocop-performance
+      rubocop-rails
+      rubocop-rake
+      rubocop-rspec (>= 2.7)
+    concurrent-ruby (1.2.2)
+    diff-lcs (1.5.0)
+    globalid (1.2.1)
+      activesupport (>= 6.1)
+    i18n (1.14.1)
+      concurrent-ruby (~> 1.0)
+    json (2.7.1)
+    minitest (5.20.0)
+    mysql2 (0.5.5)
+    parallel (1.24.0)
+    parser (3.3.0.0)
+      ast (~> 2.4.1)
+      racc
+    pg (1.5.4)
+    racc (1.7.3)
+    rack (3.0.8)
+    rainbow (3.1.1)
+    rake (13.1.0)
+    regexp_parser (2.8.3)
+    rexml (3.2.6)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.1)
+    rubocop (1.50.2)
+      json (~> 2.3)
+      parallel (~> 1.10)
+      parser (>= 3.2.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.28.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-capybara (2.18.0)
+      rubocop (~> 1.41)
+    rubocop-performance (1.17.1)
+      rubocop (>= 1.7.0, < 2.0)
+      rubocop-ast (>= 0.4.0)
+    rubocop-rails (2.19.1)
+      activesupport (>= 4.2.0)
+      rack (>= 1.1)
+      rubocop (>= 1.33.0, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
+    rubocop-rspec (2.20.0)
+      rubocop (~> 1.33)
+      rubocop-capybara (~> 2.17)
+    ruby-progressbar (1.13.0)
+    sqlite3 (1.6.9-x86_64-darwin)
+    sqlite3 (1.6.9-x86_64-linux)
+    thor (1.3.0)
+    timecop (0.9.8)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    unicode-display_width (2.5.0)
+    zeitwerk (2.6.12)
+
+PLATFORMS
+  x86_64-darwin-21
+  x86_64-darwin-22
+  x86_64-linux
+
+DEPENDENCIES
+  actionmailer
+  activejob
+  activerecord
+  appraisal
+  betterlint
+  delayed!
+  mysql2
+  pg
+  rake
+  rspec
+  sqlite3
+  timecop
+  zeitwerk
+
+BUNDLED WITH
+   2.4.13

lib/delayed/monitor.rb

@@ -34,7 +34,7 @@ def run!
     attr_reader :jobs
 
     def emit_metric!(metric)
-      send("#{metric}_grouped").reverse_merge(default_results).each do |(priority, queue), value|
+      send(:"#{metric}_grouped").reverse_merge(default_results).each do |(priority, queue), value|
         ActiveSupport::Notifications.instrument(
           "delayed.job.#{metric}",
           default_tags.merge(priority: Priority.new(priority).to_s, queue: queue, value: value),