Merge branch 'improved-reachability' into 'develop'

Reachability refactor

See merge request pleroma/pleroma!4366

lib/pleroma/object/fetcher.ex

@@ -4,7 +4,6 @@
 
 defmodule Pleroma.Object.Fetcher do
   alias Pleroma.HTTP
-  alias Pleroma.Instances
   alias Pleroma.Maps
   alias Pleroma.Object
   alias Pleroma.Object.Containment
@@ -150,10 +149,6 @@ defmodule Pleroma.Object.Fetcher do
          {:ok, body} <- get_object(id),
          {:ok, data} <- safe_json_decode(body),
          :ok <- Containment.contain_origin_from_id(id, data) do
-      if not Instances.reachable?(id) do
-        Instances.set_reachable(id)
-      end
-
       {:ok, data}
     else
       {:scheme, _} ->