Track SENSIBLE_DEFAULTS usage

This feature is deprecated, let's see how many people still rely on it.

Author: schneems

lib/language_pack/ruby.rb

@@ -113,7 +113,7 @@ def compile
     best_practice_warnings
     warn_outdated_ruby
     default_config_vars = self.class.default_config_vars(metadata: @metadata, ruby_version: @ruby_version, bundler: bundler, environment_name: environment_name)
-    setup_profiled(ruby_layer_path: "$HOME", gem_layer_path: "$HOME", ruby_version: @ruby_version, default_config_vars: default_config_vars) # $HOME is set to /app at run time
+    setup_profiled(ruby_layer_path: "$HOME", gem_layer_path: "$HOME", ruby_version: @ruby_version, default_config_vars: default_config_vars, report: @report) # $HOME is set to /app at run time
     setup_export(app_path: app_path, ruby_version: @ruby_version, default_config_vars: default_config_vars)
     cleanup
     super
@@ -339,7 +339,7 @@ def setup_export(app_path: , ruby_version: , default_config_vars: )
   end
 
   # sets up the profile.d script for this buildpack
-  def setup_profiled(ruby_layer_path: , gem_layer_path:, ruby_version: , default_config_vars: )
+  def setup_profiled(ruby_layer_path: , gem_layer_path:, ruby_version: , default_config_vars: , report:)
     profiled_path = []
 
     default_config_vars.each do |key, value|
@@ -365,6 +365,7 @@ def setup_profiled(ruby_layer_path: , gem_layer_path:, ruby_version: , default_c
     set_env_default "MALLOC_ARENA_MAX", "2"     if default_malloc_arena_max?
 
     web_concurrency = env("SENSIBLE_DEFAULTS") ? set_default_web_concurrency : ""
+    report.capture("web_concurrency.sensible_defaults" => web_concurrency.empty?)
     add_to_profiled(web_concurrency, filename: "WEB_CONCURRENCY.sh", mode: "w") # always write that file, even if its empty (meaning no defaults apply), for interop with other buildpacks - and we overwrite the file rather than appending (which is the default)
 
     # TODO handle JRUBY

lib/language_pack/test/ruby.rb

@@ -15,7 +15,7 @@ def compile
     install_binaries
     prepare_tests
     default_config_vars = self.class.default_config_vars(metadata: @metadata, ruby_version: @ruby_version, bundler: bundler, environment_name: environment_name)
-    setup_profiled(ruby_layer_path: "$HOME", gem_layer_path: "$HOME", ruby_version: @ruby_version, default_config_vars: default_config_vars) # $HOME is set to /app at run time
+    setup_profiled(ruby_layer_path: "$HOME", gem_layer_path: "$HOME", ruby_version: @ruby_version, default_config_vars: default_config_vars, report: @report) # $HOME is set to /app at run time
     setup_export(app_path: app_path, ruby_version: @ruby_version, default_config_vars: default_config_vars)
     super
   end