To make sure it's clear, Marvel is now free to use in production and development.
For Marvel 1.x, we are planning to release an updated version in the coming weeks that removes the licensing requirements.
For Marvel 2.0, upon installation, it comes with a 30-day trial license that enables all Marvel functionality. After the trial expires, you just register for a free Basic license and add it to the cluster. For multi-cluster support in Marvel, and future features like proactive detection and notification of cluster issues, a subscription license, which includes Shield, Watcher and our amazing support is necessary.