Just how much time does it take for all clients to update the metadata url

Some month ago I have changed the metadata url to other server, not the metadata itself.
According to adapools the update on the pool was confirmed.

I was about to retire the old webserver but still see many metadata http requests coming in.
Some of them Go-http-client/1.1 some with no User Agent.

Is this coming from old daedalus clients?