Add :report behavior to ActiveSupport::Deprecation

This behavior uses the ErrorReporter to report a deprecation as a
handled error with :warning severity.

activesupport/CHANGELOG.md

@@ -1,3 +1,14 @@
+*   Add `:report` behavior for Deprecation
+
+    Setting `config.active_support.deprecation = :report` uses the error
+    reporter to report deprecation warnings to `ActiveSupport::ErrorReporter`.
+
+    Deprecations are reported as handled errors, with a severity of `:warning`.
+
+    Useful to report deprecations happening in production to your bug tracker.
+
+    *Étienne Barrié*
+
 *   Rename `Range#overlaps?` to `#overlap?` and add alias for backwards compatibility
 
     *Christian Schmidt*

activesupport/lib/active_support/deprecation/behaviors.rb

@@ -45,6 +45,12 @@ class Deprecation
       end,
 
       silence: ->(message, callstack, deprecator) { },
+
+      report: ->(message, callstack, deprecator) do
+        error = DeprecationException.new(message)
+        error.set_backtrace(callstack.map(&:to_s))
+        ActiveSupport.error_reporter.report(error)
+      end
     }
 
     # Behavior module allows to determine how to display deprecation messages.
@@ -55,6 +61,7 @@ class Deprecation
     # [+stderr+]  Log all deprecation warnings to <tt>$stderr</tt>.
     # [+log+]     Log all deprecation warnings to +Rails.logger+.
     # [+notify+]  Use +ActiveSupport::Notifications+ to notify +deprecation.rails+.
+    # [+report+]  Use +ActiveSupport::ErrorReporter+ to report deprecations.
     # [+silence+] Do nothing. On \Rails, set <tt>config.active_support.report_deprecations = false</tt> to disable all behaviors.
     #
     # Setting behaviors only affects deprecations that happen after boot time.
@@ -82,6 +89,7 @@ def disallowed_behavior
       # [+stderr+]  Log all deprecation warnings to <tt>$stderr</tt>.
       # [+log+]     Log all deprecation warnings to +Rails.logger+.
       # [+notify+]  Use +ActiveSupport::Notifications+ to notify +deprecation.rails+.
+      # [+report+]  Use +ActiveSupport::ErrorReporter+ to report deprecations.
       # [+silence+] Do nothing.
       #
       # Setting behaviors only affects deprecations that happen after boot time.

activesupport/test/deprecation_test.rb

@@ -273,6 +273,17 @@ def setup
     end
   end
 
+  test ":report_error behavior" do
+    @deprecator = ActiveSupport::Deprecation.new("horizon", "MyGem::Custom")
+    @deprecator.behavior = :report
+    report = assert_error_reported(ActiveSupport::DeprecationException) do
+      @deprecator.warn
+    end
+    assert_equal true, report.handled
+    assert_equal :warning, report.severity
+    assert_equal "application", report.source
+  end
+
   test "invalid behavior" do
     e = assert_raises(ArgumentError) do
       @deprecator.behavior = :invalid