Comment 11 for bug 1835464

@seth this was only added very recently

https://github.com/systemd/systemd/commit/26ded55709947d936634f1de0f43dcf88f594621

Not on by default, and services need to order After=systemd-random-seed.service to guarantee initialized random pool.

Low entropy is an issue, Excessive entropy usage is bad, failing units due to low entropy is also bad.

I don't know if nginx unit needs a retry & backoff to attempt starting later, if and when entropy is there.