fix: Remove puma metrics

Gemfile

@@ -16,7 +16,6 @@ gem 'oai', '~> 1.1.0' # faraday needs to be updated for 1.2.0
 gem 'ougai', '~> 1.8'
 gem 'parse-cron'
 gem 'puma'
-gem 'puma-metrics'
 gem 'rails', '~> 7.0.8'
 gem 'responders'
 gem 'sidekiq', '6.5.10'

Gemfile.lock

@@ -307,7 +307,6 @@ GEM
     parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
-    prometheus-client (4.0.0)
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -319,9 +318,6 @@ GEM
     public_suffix (4.0.6)
     puma (6.4.2)
       nio4r (~> 2.0)
-    puma-metrics (1.2.5)
-      prometheus-client (>= 0.10)
-      puma (>= 5.0)
     racc (1.7.3)
     rack (2.2.9)
     rack-protection (3.0.4)
@@ -499,7 +495,6 @@ DEPENDENCIES
   pry-byebug
   pry-rails
   puma
-  puma-metrics
   rails (~> 7.0.8)
   rails-controller-testing
   responders

config/puma.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-plugin('metrics') if %w[uat staging production].include? ENV['RAILS_ENV']
-
 # To avoid SIGTERMS on scaledown in ElasticAPM
 # https://www.rubydoc.info/gems/puma/Puma%2FDSL:raise_exception_on_sigterm
 raise_exception_on_sigterm false