Ben Abrams of Doximity uses Sensu with their Chef, AWS, and VMware deployments. A former Nagios user, Ben sought a more modern monitoring solution that would fit with their AWS and autoscaling and ephemeral workflows (with Nagios, they’d need extensive custom logic). A big motivation for choosing Sensu was the ability to have app developers and operations folks proficient in the same language which could then span across entire monitoring toolchain. For Ben, Sensu is extensible: a lot of tools can do monitoring, but very few are frameworks that provide total customization. He acknowledges you could use Sensu as Nagios replacement, but can it do so much more. Sensu helps them make sure things are up and their customers are not the ones telling them things are broken.