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Nginx+Passenger error log, Checking whether to disconnect long-running connections for process

br flag

I found these errors in my Nginx error logs. I use a dedicated server (Ubuntu) with 2 websites/apps (running also a sync engine with APIs)

[ N 2022-10-21 11:40:55.2857 5800/T3 age/Cor/CoreMain.cpp:1147 ]: Checking whether to disconnect long-running connections for process 5969, application /home/admin/rails/prod/current (production)
[ N 2022-10-21 11:46:38.3071 5800/T3 age/Cor/CoreMain.cpp:1147 ]: Checking whether to disconnect long-running connections for process 7414, application /home/admin/rails/prod/current (production)
[ N 2022-10-21 11:55:15.0321 5800/T3 age/Cor/CoreMain.cpp:1147 ]: Checking whether to disconnect long-running connections for process 8201, application /home/admin/rails/prod/current (production)

What could be the long running connection ?

After a few searches, it could be a "passenger_pool_idle_time" issue ? Do I need to change it to zero ?

In the doc here it's written:

Setting the value to 0 is recommended if you're on a non-shared host that's only running a few applications, each which must be available at all times.

I'm not sure what the issue is really. Thanks in advance.

mangohost

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