FEATURE: Add pending assign reminder threshold setting

config/locales/server.en.yml

@@ -14,6 +14,7 @@ en:
     assign_mailer: "When to send notification email for assignments"
     remind_assigns: "Remind users about pending assigns."
     remind_assigns_frequency: "Frequency for reminding users about assigned topics."
+    pending_assign_reminder_threshold: "Number of pending assignments that triggers a reminder notification."
     max_assigned_topics: "Maximum number of topics that can be assigned to a user."
     assign_allowed_on_groups: "Users in these groups are allowed to assign topics and can be assigned topics."
     enable_assign_status: "Add a customizable status field to every assignment."

config/settings.yml

@@ -23,6 +23,10 @@ discourse_assign:
     client: true
     enum: "RemindAssignsFrequencySiteSettings"
     default: 0
+  pending_assign_reminder_threshold:
+    client: true
+    default: 2
+    min: 1
   max_assigned_topics:
     client: true
     default: 10

lib/pending_assigns_reminder.rb

@@ -4,7 +4,7 @@ class PendingAssignsReminder
   REMINDED_AT = "last_reminded_at"
   REMINDERS_FREQUENCY = "remind_assigns_frequency"
   CUSTOM_FIELD_NAME = "assigns_reminder"
-  REMINDER_THRESHOLD = 2
+  REMINDER_THRESHOLD = SiteSetting.pending_assign_reminder_threshold
 
   def remind(user)
     newest_topics = assigned_topics(user, order: :desc)