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a95b796a91
1c76036c61raised the number of `minfds` in Supervisor from 40k to 1M. If Supervisor cannot guarantee that number of available file descriptors, it will fail to start; `/etc/security/limits.conf` was hence adjusted upwards as well. However, on some virtualized environments, including Proxmox LXC, setting `/etc/security/limits.conf` may not be enough to raise the system-level limits. This causes `supervisord` with the larger `minfds` to fail to start. The limit of 1000000 was chosen to be arbitrarily high, assuming it came without cost; it is not expected to ever be reached on any deployment.262b19346ealready lowered one aspect of that changeset, upon determining it did come with a cost. Potentially breaking virtualized deployments during upgrade is another cost of that change. Lower the `minfds` it back down to 40k, partially reverting1c76036c61, but allow adjusting it upwards for extremely large deployments. We do not expect any except the largest deployments to ever hit the 40k limit, and a frictionless deployment for the vanishingly small number of huge deployments is not worth the potential upgrade hiccups for the much more frequent smaller deployments.