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Sysadmins slam Apple’s SSL/TLS cert lifespan cuts
(www.theregister.com)
This is a most excellent place for technology news and articles.
I'm not familiar with either, but Duck Duck Go suggests:
https://www.citrix.com/blogs/2015/12/09/using-lets-encrypt-for-free-ssl-certs-with-netscaler/
https://techdrabble.com/citrix/netscaler/18-letsencrypt-automated-certificate-with-citrix-netscaler
https://docs.netscaler.com/en-us/netscaler-application-delivery-management-software/current-release/networks/ssl-certificate-dashboard/how-to-install-ssl-certificates-on-netscaler-instance.html
https://www.f5.com/company/blog/nginx/using-free-ssltls-certificates-from-lets-encrypt-with-nginx