I'm seeing quite a lot of strange looking URL requests on the civicrm/mailing/url path, which is supposed to take 2 params (as I understand): u=<integer> and qid=<integer>, but these requests are coming with other, seemingly random query params, like d=34273&thf=42882749 or j=73737&hjb=67859229. The requests are coming from a range of IPs and (apparent) User Agents, but they do come in flurries e.g. 12 within one minute.

These are all just generating server errors, since it can't process without valid u value, but should I be concerned?

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