Merge branch '1505-threads-federation' into 'develop'

[#1505] Threads / replies federation

Closes #1505

See merge request pleroma/pleroma!2129

config/config.exs

@@ -328,6 +328,7 @@ config :pleroma, :activitypub,
   unfollow_blocked: true,
   outgoing_blocks: true,
   follow_handshake_timeout: 500,
+  note_replies_output_limit: 5,
   sign_object_fetches: true,
   authorized_fetch_mode: false
 
@@ -483,6 +484,7 @@ config :pleroma, Oban,
     transmogrifier: 20,
     scheduled_activities: 10,
     background: 5,
+    remote_fetcher: 2,
     attachments_cleanup: 5,
     new_users_digest: 1
   ],

config/description.exs

@@ -662,7 +662,7 @@ config :pleroma, :config_description, [
         label: "Fed. incoming replies max depth",
         type: :integer,
         description:
-          "Max. depth of reply-to activities fetching on incoming federation, to prevent out-of-memory situations while" <>
+          "Max. depth of reply-to and reply activities fetching on incoming federation, to prevent out-of-memory situations while" <>
             " fetching very long threads. If set to `nil`, threads of any depth will be fetched. Lower this value if you experience out-of-memory crashes.",
         suggestions: [
           100
@@ -1790,6 +1790,12 @@ config :pleroma, :config_description, [
         type: :boolean,
         description: "Sign object fetches with HTTP signatures"
       },
+      %{
+        key: :note_replies_output_limit,
+        type: :integer,
+        description:
+          "The number of Note replies' URIs to be included with outgoing federation (`5` to match Mastodon hardcoded value, `0` to disable the output)."
+      },
       %{
         key: :follow_handshake_timeout,
         type: :integer,