What does your "deployment" entail? The plugin list is stored in the database, so you should be able to restore that key if you wish.

@Muhammad-Saqib I wasn't suggesting that you specifically implement it, just that you should wait until someone does. If you can implement it, then please do!

Whoever it is, it's not us... as @pitaj suggests it could be bots issuing HEAD requests to determine site availability before crawling? Who knows... I am looking at some of them coming in our logging system now, but they have no user agent either, so