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diff --git a/lib/pleroma/web/pleroma_api/controllers/instances_controller.ex b/lib/pleroma/web/pleroma_api/controllers/instances_controller.ex
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+++ b/lib/pleroma/web/pleroma_api/controllers/instances_controller.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.PleromaAPI.InstancesController do
+  use Pleroma.Web, :controller
+
+  alias Pleroma.Instances
+
+  plug(Pleroma.Web.ApiSpec.CastAndValidate)
+
+  defdelegate open_api_operation(action), to: Pleroma.Web.ApiSpec.PleromaInstancesOperation
+
+  def show(conn, _params) do
+    unreachable =
+      Instances.get_consistently_unreachable()
+      |> Map.new(fn {host, date} -> {host, to_string(date)} end)
+
+    json(conn, %{"unreachable" => unreachable})
+  end
+end