411 vs Vulcan: What are the differences?
411: An Alert Management Web Application, by Etsy. Configure Searches to periodically run against a variety of data sources. You can define a custom pipeline of Filters to manipulate any generated Alerts and forward them to multiple Targets. Review and manage Alerts through the web interface. You can apply Renderers to alerts to enrich them with additional metadata; 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.
411 and Vulcan can be primarily classified as "Monitoring" tools.
411 and Vulcan are both open source tools. 411 with 862 GitHub stars and 97 forks on GitHub appears to be more popular than Vulcan with 542 GitHub stars and 32 GitHub forks.