最新の can't alloc thread エラーのバックトレースは次のとおりです。
Message (159137 copies reported)
Job exception: can't alloc thread
Backtrace
/usr/local/lib/ruby/3.4.0/socket.rb:712:in 'Thread.new'
/usr/local/lib/ruby/3.4.0/socket.rb:712:in 'block in Socket.tcp_with_fast_fallback'
/usr/local/lib/ruby/3.4.0/socket.rb:710:in 'Array#map'
/usr/local/lib/ruby/3.4.0/socket.rb:710:in 'Socket.tcp_with_fast_fallback'
/usr/local/lib/ruby/3.4.0/socket.rb:661:in 'Socket.tcp'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client/ruby_connection.rb:122:in 'RedisClient::RubyConnection#connect'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client/ruby_connection.rb:48:in 'RedisClient::RubyConnection#initialize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:815:in 'Class#new'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:815:in 'block in RedisClient#connect'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client/middlewares.rb:12:in 'RedisClient::BasicMiddleware#connect'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:814:in 'RedisClient#connect'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:800:in 'RedisClient#raw_connection'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:759:in 'RedisClient#ensure_connected'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-client-0.26.1/lib/redis_client.rb:352:in 'RedisClient#call_v'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-5.4.0/lib/redis/client.rb:90:in 'Redis::Client#call_v'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/rack-mini-profiler-4.0.1/lib/mini_profiler/profiling_methods.rb:90:in 'block in Redis::Client#profile_method'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-5.4.0/lib/redis.rb:152:in 'block in Redis#send_command'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-5.4.0/lib/redis.rb:151:in 'Monitor#synchronize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-5.4.0/lib/redis.rb:151:in 'Redis#send_command'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/redis-5.4.0/lib/redis/commands/keys.rb:256:in 'Redis::Commands::Keys#del'
/var/www/discourse/lib/discourse_redis.rb:168:in 'block in DiscourseRedis#del'
/var/www/discourse/lib/discourse_redis.rb:29:in 'DiscourseRedis.ignore_readonly'
/var/www/discourse/lib/discourse_redis.rb:165:in 'DiscourseRedis#del'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/distributed_mutex.rb:48:in 'MiniScheduler::DistributedMutex#synchronize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/distributed_mutex.rb:15:in 'MiniScheduler::DistributedMutex.synchronize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:365:in 'MiniScheduler::Manager#lock'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:316:in 'MiniScheduler::Manager#tick'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler.rb:74:in 'block (2 levels) in MiniScheduler.start'
これは別のものです
Message (2661 copies reported)
Job exception: can't alloc thread
Backtrace
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:63:in 'Thread.new'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:63:in 'block in MiniScheduler::Manager::Runner#ensure_worker_threads'
```internal:numeric`:257:in 'Integer#times'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:63:in 'MiniScheduler::Manager::Runner#ensure_worker_threads'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:23:in 'block (2 levels) in MiniScheduler::Manager::Runner#initialize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:20:in 'Thread::Mutex#synchronize'
/var/www/discourse/vendor/bundle/ruby/3.4.0/gems/mini_scheduler-0.18.0/lib/mini_scheduler/manager.rb:20:in 'block in MiniScheduler::Manager::Runner#initialize'
セットアップ中に1GBメモリのDigital Oceanドロッパーを使用しています。もし関連があればですが。推奨サイズではないことは承知していますが、実際にトラフィックがない限り問題ないだろうと思っていました。