This was not here last night but just showed up in the past 5 minutes. I can't find anything on spigot / github or in the docs unless I am blind

I've restarted, removed plugins one by one etc but it still keeps spamming away. I am currently on the latest version that you get on spigot from version history.

Is there any error on server startup, before the spam?

Can you try resetting your config.yml (rename the old one)?

I did reset it yes, that worked. I must of done something that it did not like.

Could you please give me the "bugged" configuration please?

No, I didn't keep a backup of it nor any of the logs sorry. I'll try and reproduce it.