Connection pool: implement logging and telemetry events

lib/pleroma/application.ex

@@ -39,6 +39,7 @@ defmodule Pleroma.Application do
     # every time the application is restarted, so we disable module
     # conflicts at runtime
     Code.compiler_options(ignore_module_conflict: true)
+    Pleroma.Telemetry.Logger.attach()
     Config.Holder.save_default()
     Pleroma.HTML.compile_scrubbers()
     Config.DeprecationWarnings.warn()