Since when did the

System

account start changing log levels on M/R scripts?

It always has. It's not limited to M/R scripts. This is what happens when any script logs more than 100k logs in any 60-minute period; that triggers NetSuite to automatically reduce the logging level of the "loudest" scripts.

Script owners are notified if NetSuite detects that a script is logging excessively and NetSuite automatically adjusts the log level.

Thanks, @erictgrubaugh. Somehow, I've never run into this despite puking logs at what I thought were high rates for a long time.

I too am an excessive logger

NS usually emails you when it hits those thresholds, so it shouldn't come as a surprise? i guess maybe only if you're the script owner?

^ The last part

Ah ha, it's a generic login and I don't manage the email account.

this is one reason NFT supports any number of named loggers, each with their own verbosity settings. Quite flexible in controlling how many (and which) log calls actually land in the execution log.

I used NFT on a project awhile back, it worked great!