Automated cherry pick of #11986 #12062
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…r will check File Descriptor Requirements ,and count all fds in used. And recorded some logs when in used >= limit/5*4. Just recorded message. If fds was more than 10K,It's low performance due to FDUsage() works. So need to increase it. see #11969 for more detail.
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Cherry pick of #11986 on release-3.3.
#11986: etcdserver:FDUsage set ticker to 10 minute from 5 seconds.