メモリもりもり継続。諦めて$7/月余分に払うことにしますね。
$ heroku config:set RUBY_GC_HEAP_GROWTH_FACTOR=1.2 RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR=1.1 RUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR=1.05 RUN_WORKER=false SIDEKIQ_THREADS=4
$ heroku ps:scale worker=1
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