refactor: extract ApplicationVersion version from sentry

app/controllers/application_controller.rb

@@ -339,7 +339,7 @@ class ApplicationController < ActionController::Base
       environment: sentry[:environment],
       browser: { modern: BrowserSupport.supported?(browser) },
       user: sentry_user,
-      release: SentryRelease.current
+      release: ApplicationVersion.current
     }
   end
 

config/initializers/application_version.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class ApplicationVersion
+  @@current = nil
+
+  # Detect the current release version, which helps Sentry identifying the current release
+  # or can be used as cache key when for some contents susceptible to change between releases.
+  #
+  # The deploy process can write a "version" file at root
+  # containing a string identifying the release, like the sha256 commit used by its release.
+  # It defaults to a random string if the file is not found (so each restart will behave like a new version)
+  def self.current
+    @@current ||= begin
+      version = Rails.root.join('version')
+      version.readable? ? version.read.strip : SecureRandom.hex
+    end
+    @@current.presence
+  end
+end

config/initializers/sentry.rb

@@ -1,15 +1,3 @@
-class SentryRelease
-  @@current = nil
-
-  def self.current
-    @@current ||= begin
-      version = Rails.root.join('version')
-      version.readable? ? version.read.strip : ''
-    end
-    @@current.presence
-  end
-end
-
 Sentry.init do |config|
   secrets = Rails.application.secrets.sentry
 
@@ -19,7 +7,7 @@ Sentry.init do |config|
 
   config.dsn = secrets[:enabled] ? secrets[:rails_client_key] : nil
   config.send_default_pii = false
-  config.release = SentryRelease.current
+  config.release = ApplicationVersion.current
   config.environment = secrets[:environment] || Rails.env
   config.enabled_environments = ['production', secrets[:environment].presence].compact
   config.breadcrumbs_logger = [:active_support_logger]