[MRG+1] Added MEMUSAGE_CHECK_INTERVAL_SECONDS to Memory usage extension options. #1282
I noticed a scraper I was working with would spawn enough items to blow well past my assigned MEMUSAGE_LIMIT_MB before the MEMUSAGE extension ran its next scheduled check.
I thought it might be useful to be able to alter the memory use check frequency, if you wanted, to have a better chance of a graceful shutdown.
Kept the default as it was, at 60.0 seconds.