Merge branch '2.x' into 3.x

Author: Lobster

lib/redmine_zulip/api.rb

@@ -41,7 +41,8 @@ def send(type:, to:, content:, subject: nil)
           http.request(req)
         end
         res.code == "200"
-      rescue SocketError => _
+      rescue SocketError => e
+        Rails.logger.warn("Zulip API error: #{e.message}")
         false
       end
     end