Ever wanted nested virtualization inside a virtual machine that you are running on a Hyper-V host? I have! Looking around the GUI, the option cannot be found - that's because it's not there! Here's how to enable it!
Could you use smartd to send emails via Postfix/sendmail on your Linux box? Sure. Could you use Jenkins to trigger individual smartctl queries and then tell Pushover to send a push notification to your devices saying that you have a drive failure? Also, yes.
With NX-OS devices, you can run a command to allow unsupported transceivers. Obviously, Cisco does not recommend this but it can help when you're in a pinch and need to order more Cisco branded SFPs or DACs. The funny thing is - this command cannot be found in the help so no tab-to-complete!