Return warnings for performance bar from backend

For each DetailedView subclass, we add a `warnings` array to:

1. The top-level response.
2. Each individual call under the `details` key.

We use the `.thresholds` hash on the DetailedView to determine what's a
warning. If that hash is empty (the default), then the warnings array
will always be empty.

1 files changed, 18 insertions, 0 deletions

diff --git a/lib/peek/views/active_record.rb b/lib/peek/views/active_record.rb
index 2d78818630d..a35783c1971 100644
--- a/lib/peek/views/active_record.rb
+++ b/lib/peek/views/active_record.rb
@@ -3,6 +3,24 @@
 module Peek
   module Views
     class ActiveRecord < DetailedView
+      DEFAULT_THRESHOLDS = {
+        calls: 100,
+        duration: 3,
+        individual_call: 1
+      }.freeze
+
+      THRESHOLDS = {
+        production: {
+          calls: 100,
+          duration: 15,
+          individual_call: 5
+        }
+      }.freeze
+
+      def self.thresholds
+        @thresholds ||= THRESHOLDS.fetch(Rails.env.to_sym, DEFAULT_THRESHOLDS)
+      end
+
       private
 
       def setup_subscribers