Sensu vs Vulcan: What are the differences?
Sensu: Open source monitoring framework. A monitoring framework that aims to be simple, malleable, and scalable. Essentially, Sensu takes the results of “check” scripts run across many systems, and if certain conditions are met; passes their information to one or more “handlers”. Checks are used, for example, to determine if a service like Apache is up or down; Vulcan: DigitalOcean's API-compatible alternative to Prometheus. Vulcan is an API-compatible alternative to Prometheus. It aims to provide a better story for long-term storage, data durability, high cardinality metrics, high availability, and scalability. Vulcan is much more complex to operate, but should integrate with ease to an existing Prometheus environment.
Sensu and Vulcan can be categorized as "Monitoring" tools.
Sensu and Vulcan are both open source tools. It seems that Sensu with 2.96K GitHub stars and 389 forks on GitHub has more adoption than Vulcan with 542 GitHub stars and 32 GitHub forks.